Year 1 · Adding and Subtracting within 10 · Summary
Year 1 Adding and Subtracting within 10: summary and key words
Part of the Year 1 adding and subtracting within 10 chapter. Chapter overview · whole chapter on one page
Chapter summary
| Skill | Method |
|---|---|
| Add (put together) | Start at the bigger number and count on the smaller number. 5 + 2 = 7. |
| Subtract (take away) | Start with the whole, take away, then count what is left. Or count back: 8 − 3 = 5. |
| Part-whole and number bonds | The parts add up to the whole. 3 and 7 are a number bond to 10: 3 + 7 = 10. |
| Fact families | Use the same three numbers to make two addition and two subtraction sentences. |
| Missing numbers | Find the number that makes the sentence true. Count on or count back. |
| Zero | Adding zero or taking away zero leaves the number. Taking away all of them leaves 0. |
Can you…?
- I can put groups together and count on to add
- I can take away and count back to subtract
- I can use the part-whole model and number bonds to 10
- I can read and write + , − and = number sentences
- I can write a fact family from three numbers
- I can find a missing number in a sentence
- I can use zero when adding and taking away
- I can solve a one-step problem with pictures
Key terms
- add
- to put groups together, or to make a total bigger
- subtract
- to take away, or to find how many are left
- count on
- start at one number and keep going up, one step at a time
- count back
- start at one number and go down, one step at a time
- whole
- the total, which the parts make together
- part
- one of the smaller numbers that make up the whole
- number bond
- two numbers that make a total, such as 3 and 7 make 10
- fact family
- number sentences that use the same three numbers
- missing number
- a number we need to find, shown with a box
- zero
- none at all; written as 0