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Grade 3 Mathematics on Temari has 36 revision cards, arranged by the chapters of the Ethiopian national curriculum. Every card says when the rule applies, what each symbol in it stands for, and the mistake students most often make with it. They are free to read and need no account.
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When you use it
Use when rounding numbers up to 10,000 to the nearest 10, 100, or 1,000.
Watch out
If the digit immediately to the right is 5 or greater, add 1 to the target place value digit and replace all digits to the right with zeros.
Drafted from Grade 3 Mathematics, pages 17-30, then checked twice before it went up
When you use it
Use when subtracting numbers in columns and the digit on top is smaller than the digit below it.
Watch out
Never reverse the subtraction by subtracting the top digit from the bottom one. Regroup by borrowing 1 from the next higher place value.
Drafted from Grade 3 Mathematics, pages 17-30, then checked twice before it went up
When you use it
Use to identify the parts of a subtraction problem or find the difference between two quantities.
Watch out
Always subtract the smaller number from the larger number to find the difference between two quantities.
Drafted from Grade 3 Mathematics, pages 17-30, then checked twice before it went up
When you use it
Use this to verify whether a subtraction problem has been solved correctly.
Watch out
Adding the subtrahend and the difference must yield the exact original minuend.
Drafted from Grade 3 Mathematics, pages 31-41, then checked twice before it went up
When you use it
Use this when any whole number is multiplied by zero.
Watch out
The product of any number and zero is always zero, not the number itself.
Drafted from Grade 3 Mathematics, pages 31-41, then checked twice before it went up
When you use it
Use this to quickly multiply a multiple of 10 or 100 by a single digit number.
Watch out
Multiply the non-zero digits first, then write the same number of trailing zeros to the right of the result.
Drafted from Grade 3 Mathematics, pages 31-41, then checked twice before it went up
When you use it
Use this when multiplying digits in a place value produces a two digit number.
Watch out
Multiply the next place value first, then add the carried amount. Never add the carried digit before multiplying.
Drafted from Grade 3 Mathematics, pages 31-41, then checked twice before it went up
When you use it
Use this method to find the quotient by repeatedly subtracting the divisor from the dividend until zero is reached.
Watch out
Count the number of subtractions made to find the quotient, not the zero at the end.
Drafted from Grade 3 Mathematics, pages 42-69, then checked twice before it went up
When you use it
Use this rule to quickly find whether a whole number divides by 2 evenly or leaves a remainder.
Watch out
When dividing any whole number by 2, the remainder can only be 0 or 1.
Drafted from Grade 3 Mathematics, pages 42-69, then checked twice before it went up
When you use it
Use this formula to check the correctness of a division problem that has a remainder.
Watch out
The remainder must always be smaller than the divisor.
Drafted from Grade 3 Mathematics, pages 42-69, then checked twice before it went up
| Fraction | Name |
|---|---|
| Half | |
| Third | |
| Quarter | |
| Fifth | |
| Tenth |
When you use it
Use this table to write or read common fraction names correctly.
Drafted from Grade 3 Mathematics, pages 70-83, then checked twice before it went up
When you use it
Use this rule when comparing two unit fractions where each numerator is 1.
Watch out
A larger denominator gives a smaller fraction value.
Drafted from Grade 3 Mathematics, pages 70-83, then checked twice before it went up
When you use it
Check this when ordering unit fractions from least to greatest.
Watch out
Do not think 1/8 is bigger than 1/4 just because 8 is bigger than 4.
Drafted from Grade 3 Mathematics, pages 70-83, then checked twice before it went up
When you use it
Use this formula to check the correctness of a division calculation.
Watch out
The remainder must always be strictly less than the divisor.
Drafted from Grade 3 Mathematics, pages 70-83, then checked twice before it went up
When you use it
Use this rule to find or verify fractions that have different numerators and denominators but equal values.
Watch out
Always multiply or divide both the numerator and the denominator by the exact same non-zero number.
Drafted from Grade 3 Mathematics, page 84 onwards, then checked twice before it went up
When you use it
Use this to find missing or future terms in a sequence where each member is larger than the previous one.
Watch out
Check whether the number added between consecutive terms stays constant or increases at each step.
Drafted from Grade 3 Mathematics, page 84 onwards, then checked twice before it went up
When you use it
Use this to calculate a half or a quarter share of a given whole number.
Watch out
To find half, divide by 2. To find quarter, divide by 4.
Drafted from Grade 3 Mathematics, page 84 onwards, then checked twice before it went up
When you use it
Use this to identify repeating sequences and predict distant members by identifying the base repeating block.
Watch out
The core is the shortest repeating unit that builds the whole pattern.
Drafted from Grade 3 Mathematics, page 84 onwards, then checked twice before it went up
When you use it
Use this to add multiples of 1000 mentally.
Watch out
Add only the digits in the thousands place and attach exactly three zeros to the right of the sum.
Drafted from Grade 3 Mathematics, page 22 onwards, then checked twice before it went up
When you use it
Use this when adding whole numbers vertically where the sum of digits in any place value is 10 or greater.
Watch out
Always start adding from the ones place and carry over the tens digit to the next place value to the left.
Drafted from Grade 3 Mathematics, page 22 onwards, then checked twice before it went up
When you use it
Use this to identify parts of a subtraction problem and check subtraction by adding the subtrahend to the difference.
Watch out
To verify a subtraction, the minuend must equal the subtrahend plus the difference.
Drafted from Grade 3 Mathematics, page 22 onwards, then checked twice before it went up
When you use it
Use this when the top digit in a column is smaller than the bottom digit during vertical subtraction.
Watch out
When you borrow 1 from the next place value on the left, reduce that left digit by 1 before completing the subtraction.
Drafted from Grade 3 Mathematics, page 22 onwards, then checked twice before it went up
When you use it
Use this rule when comparing two fractions that both have 1 as their numerator.
Watch out
A larger denominator means smaller parts. For example, 1/4 is greater than 1/6.
Drafted from Grade 3 Mathematics, pages 77-142, then checked twice before it went up
When you use it
Use this to find fractions that have different numerators and denominators but equal value.
Watch out
Always multiply or divide both the numerator and the denominator by the exact same non-zero number.
Drafted from Grade 3 Mathematics, pages 77-142, then checked twice before it went up
When you use it
Use this to calculate a half or a quarter of a given whole number.
Watch out
To find a half, divide the number by 2. To find a quarter, divide the number by 4.
Drafted from Grade 3 Mathematics, pages 77-142, then checked twice before it went up
When you use it
Use this to check that the arithmetic operation matches the direction of unit conversion.
Watch out
Do not divide when converting from a larger unit to a smaller unit. Always multiply by the conversion factor.
Drafted from Grade 3 Mathematics, pages 143-154, then checked twice before it went up
| Larger Unit | Smaller Unit | Relationship | To Convert |
|---|---|---|---|
When you use it
Use this to convert length measurements from larger units to smaller units.
Watch out
Remember to multiply by 100 when converting metres to centimetres, not 10 or 1000.
Drafted from Grade 3 Mathematics, pages 143-154, then checked twice before it went up
| Larger Unit | Smaller Unit | Relationship | To Convert |
|---|---|---|---|
When you use it
Use this to convert mass measurements from larger metric units to smaller units.
Watch out
Quintal converts to kilogram by multiplying by 100, while kilogram converts to gram by multiplying by 1000.
Drafted from Grade 3 Mathematics, pages 143-154, then checked twice before it went up
When you use it
Use this when choosing the correct unit to measure the amount of liquid a container holds.
Watch out
Millilitres are for measuring small amounts of liquid, while litres are used for larger amounts.
Drafted from Grade 3 Mathematics, pages 143-154, then checked twice before it went up
| Banknote | Equivalent Value |
|---|---|
When you use it
Use this table when converting a larger Ethiopian Birr banknote into smaller banknotes.
Watch out
Make sure the total value remains equal after breaking a large note into smaller ones.
Drafted from Grade 3 Mathematics, pages 155-166, then checked twice before it went up
| Banknote | Santim Value |
|---|---|
When you use it
Use this table when converting paper banknotes directly into santim coins.
Watch out
Be careful with the count of coins since each Birr equals two 50 santim coins.
Drafted from Grade 3 Mathematics, pages 155-166, then checked twice before it went up
| Coin | Equivalent Value |
|---|---|
When you use it
Use this reference when exchanging coins into smaller santim denominations.
Watch out
Remember that fifty santim can be exchanged into two twenty-five santim coins or five ten santim coins.
Drafted from Grade 3 Mathematics, pages 155-166, then checked twice before it went up
When you use it
Use this technique when finding the total number of smaller units obtained from several banknotes or coins.
Watch out
Multiply the number of notes you have by the single-note exchange rate, do not just add the single-note rate.
Drafted from Grade 3 Mathematics, pages 155-166, then checked twice before it went up
When you use it
Use when converting a given time in hours into minutes.
Watch out
When converting hours and additional minutes, multiply only the hours by 60 and add the remaining minutes.
Drafted from Grade 3 Mathematics, page 167 onwards, then checked twice before it went up
| Unit | Equivalent Value |
|---|---|
When you use it
Use when converting between hours, days, weeks, months, and years.
Watch out
In the Ethiopian calendar, regular months are counted as 30 days, while Pagume has 5 or 6 days.
Drafted from Grade 3 Mathematics, page 167 onwards, then checked twice before it went up
When you use it
Use when converting minutes to hours or calculating elapsed time.
Watch out
Do not divide or multiply by 100 when working with time. 1 hour is 60 minutes, not 100 minutes.
Drafted from Grade 3 Mathematics, page 167 onwards, then checked twice before it went up
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