Free short notes and revision cards
Grade 1 Mathematics on Temari has 22 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 writing comparison statements between two numbers.
Watch out
The open wide side of the symbol always faces the larger number, while the pointed end points to the smaller number.
Drafted from Grade 1 Mathematics, pages 24-40, then checked twice before it went up
When you use it
Use to identify the number that comes immediately before or after a given number.
Watch out
The predecessor is the number immediately to the left, while the successor is the number immediately to the right.
Drafted from Grade 1 Mathematics, pages 24-40, then checked twice before it went up
When you use it
Use this technique to express a single number as the sum of two smaller numbers.
Watch out
Check that the two parts always add up exactly to the target number.
Drafted from Grade 1 Mathematics, pages 41-58, then checked twice before it went up
When you use it
Use this rule to quickly add two equal numbers or two consecutive numbers.
Watch out
A near double is exactly 1 more than the double, not 2 more.
Drafted from Grade 1 Mathematics, pages 41-58, then checked twice before it went up
| First Number | Second Number | Total |
|---|---|---|
When you use it
Use these number pairs to break down or combine numbers that add up to 10.
Drafted from Grade 1 Mathematics, pages 41-58, then checked twice before it went up
When you use it
Keep in mind when dealing with the order or grouping of numbers in subtraction.
Watch out
Addition has commutative and associative properties, but subtraction does not.
Drafted from Grade 1 Mathematics, page 59 onwards, then checked twice before it went up
When you use it
Use this to find an unknown part or to check a subtraction result using addition.
Watch out
The total from addition becomes the starting number in subtraction.
Drafted from Grade 1 Mathematics, page 59 onwards, then checked twice before it went up
When you use it
Use this rule when subtracting two identical numbers.
Watch out
The result of subtracting a number from itself is always zero, not one.
Drafted from Grade 1 Mathematics, page 59 onwards, then checked twice before it went up
When you use it
Use when adding a one-digit or two-digit number to a two-digit number.
Watch out
Always add ones to ones and tens to tens. Never add a ones digit directly to a tens digit.
Drafted from Grade 1 Mathematics, pages 85-100, then checked twice before it went up
When you use it
Use to decide which of two numbers is greater, smaller, or equal.
Watch out
Always compare the tens digits first. Only compare the ones digits if the tens digits are equal.
Drafted from Grade 1 Mathematics, pages 85-100, then checked twice before it went up
| Number | Tens | Ones |
|---|---|---|
| 26 | 2 | 6 |
| 45 | 4 | 5 |
| 78 | 7 | 8 |
| 93 | 9 | 3 |
When you use it
Use to identify the number of tens and ones in any two-digit number.
Watch out
The digit on the left represents tens and the digit on the right represents ones. Do not reverse their order.
Drafted from Grade 1 Mathematics, pages 85-100, then checked twice before it went up
When you use it
Use when taking away a one-digit number from a two-digit number.
Watch out
Subtract the ones digit from the ones digit while keeping the tens digit the same.
Drafted from Grade 1 Mathematics, pages 85-100, then checked twice before it went up
When you use it
Use this technique to subtract a two-digit number from another two-digit number without borrowing.
Watch out
Always subtract ones from ones first, then tens from tens. Do not mix place values.
Drafted from Grade 1 Mathematics, pages 101-113, then checked twice before it went up
When you use it
Use this when defining how sides meet to form geometric shapes.
Watch out
A vertex is the meeting point of two sides, while an angle is the space formed between those two sides at the vertex.
Drafted from Grade 1 Mathematics, pages 101-113, then checked twice before it went up
When you use it
Use when identifying common traditional ways to measure length.
Watch out
Body parts like spans and cubits vary from person to person, so they do not give an exact fixed measurement.
Drafted from Grade 1 Mathematics, pages 114-122, then checked twice before it went up
When you use it
Use this when relating or comparing lengths in meters and centimeters.
Watch out
Centimeter is smaller than meter.
Drafted from Grade 1 Mathematics, pages 123-135, then checked twice before it went up
When you use it
Use this when adding, subtracting, or comparing measurements.
Watch out
Only add, subtract, or compare quantities that have the exact same unit.
Drafted from Grade 1 Mathematics, pages 123-135, then checked twice before it went up
| Quantity | Standard Units | Traditional Units |
|---|---|---|
| Length | m, cm | Pace, Cubit, Span |
| Mass | kg, g | Sack, Tin, Jug |
| Capacity | L, mL | Cup, Glass, Jerrycan, Clay pot |
When you use it
Use this to identify standard measuring units and traditional tools for length, mass, and capacity.
Watch out
Traditional units vary in size, while standard units like meter, kilogram, and liter are fixed.
Drafted from Grade 1 Mathematics, pages 123-135, then checked twice before it went up
| Base Amount | Equivalent In Coins |
|---|---|
When you use it
Use when exchanging Birr notes and coins into smaller denominations.
Watch out
One Birr equals 100 cents, not 10 cents.
Drafted from Grade 1 Mathematics, page 136 onwards, then checked twice before it went up
| Order | Day of the Week |
|---|---|
| Monday / ሰኞ / Wixata | |
| Tuesday / ማክሰኞ / Kibxata | |
| Wednesday / ረቡዕ / Roobii | |
| Thursday / ሐሙስ / Kamiisa | |
| Friday / አርብ / Jimmata | |
| Saturday / ቅዳሜ / Sanbata Duraa | |
| Sunday / እሑድ / Dilbata |
When you use it
Use when naming days in order or calculating future and past days.
Watch out
A week always has 7 days.
Drafted from Grade 1 Mathematics, page 136 onwards, then checked twice before it went up
| Clock Hand | Indicates |
|---|---|
| Short hand | Hour |
| Medium hand | Minute |
| Long hand | Second |
When you use it
Use when reading time from an analog clock face.
Watch out
The shortest hand shows the hour, while the longer hands show minutes and seconds.
Drafted from Grade 1 Mathematics, page 136 onwards, then checked twice before it went up
| Unit | Equivalent |
|---|---|
| 1 day | |
| 1 hour | |
| 1 minute | |
| 1 week |
When you use it
Use when converting between days, hours, minutes, and seconds.
Watch out
One day has 24 hours, not 12 hours.
Drafted from Grade 1 Mathematics, page 136 onwards, then checked twice before it went up
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