Free short notes and revision cards
Grade 4 Mathematics on Temari has 15 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 this rule to determine which of two numbers is larger or smaller.
Watch out
First count the number of digits. If the digit counts are equal, compare digits starting from the leftmost place.
Drafted from Grade 4 Mathematics, pages 7-29, then checked twice before it went up
| Position from right | Place value multiplier |
|---|---|
| 1st | |
| 2nd | |
| 3rd | |
| 4th | |
| 5th | |
| 6th |
When you use it
Use this to identify the value of any digit in a number up to six digits.
Watch out
Always count positions starting from the rightmost digit, which is the ones place.
Drafted from Grade 4 Mathematics, pages 7-29, then checked twice before it went up
When you use it
Use when converting words or expanded forms containing zero places into standard digits.
Watch out
Writing seven hundred thousand nine as 709 instead of 700,009 loses the place value holders.
Drafted from Grade 4 Mathematics, pages 7-29, then checked twice before it went up
When you use it
Use this to express a whole number as the sum of the values of each of its digits.
Watch out
Do not confuse the digit with its place value. A digit 4 in the ten thousands place has a value of 40,000, not 4.
Drafted from Grade 4 Mathematics, pages 7-29, then checked twice before it went up
When you use it
Use when arranging numbers vertically before performing addition or subtraction.
Watch out
Align digits starting from the ones place on the right, never from the leftmost digit.
Drafted from Grade 4 Mathematics, pages 30-43, then checked twice before it went up
When you use it
Use these properties to reorder or group whole numbers to compute sums more easily.
Watch out
Commutative and associative properties apply to addition, not to subtraction.
Drafted from Grade 4 Mathematics, pages 30-43, then checked twice before it went up
When you use it
Use this relationship to check the correctness of a subtraction result.
Watch out
To check subtraction, add the difference to the subtrahend to get the minuend.
Drafted from Grade 4 Mathematics, pages 30-43, then checked twice before it went up
When you use it
Use when adding multi-digit whole numbers vertically from right to left.
Watch out
Always add the carried over digit to the next place value column on the left.
Drafted from Grade 4 Mathematics, pages 30-43, then checked twice before it went up
When you use it
Use this to multiply numbers by breaking them into place value parts before multiplying.
Watch out
Multiply every split component by the multiplier before adding the partial products.
Drafted from Grade 4 Mathematics, pages 44-81, then checked twice before it went up
When you use it
Use this rule to quickly multiply any non zero whole number by 10.
Watch out
Write a single zero at the right end of the number, do not add the number 10.
Drafted from Grade 4 Mathematics, pages 44-81, then checked twice before it went up
When you use it
Use this formula to check subtraction results or to find a missing minuend.
Watch out
Subtraction is not commutative, so swapping minuend and subtrahend gives an incorrect result.
Drafted from Grade 4 Mathematics, pages 44-81, then checked twice before it went up
When you use it
Use when evaluating expressions involving zero as a divisor or dividend.
Watch out
Dividing any number by zero is impossible, while zero divided by any non-zero number is zero.
Drafted from Grade 4 Mathematics, pages 82-116, then checked twice before it went up
When you use it
Use this to verify whether a division calculation with or without a remainder is correct.
Watch out
The remainder must always be strictly less than the divisor.
Drafted from Grade 4 Mathematics, pages 82-116, then checked twice before it went up
| Expression | Equivalent Form |
|---|---|
When you use it
Use these properties to simplify calculations and reorder whole number factors.
Watch out
Division does not have commutative or associative properties.
Drafted from Grade 4 Mathematics, pages 82-116, then checked twice before it went up
When you use it
Use for quick mental computation when scaling whole numbers by 10.
Watch out
When dividing a number that does not end in zero by 10, the ones digit becomes the remainder.
Drafted from Grade 4 Mathematics, pages 82-116, then checked twice before it went up
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