Balance addition equations – up to two digits
Learn with an example
Which number makes the equation true?
11 + 1 = 10 + ___
First, add 11 + 1:
11+1 =10 +?
12 = 10+?
Decide which number makes the addition number sentence true. You can think of an addition fact you know, or you can subtract to find the answer.
The addition fact is:
10 + 2 = 12
Did you remember this addition fact? If not, you can find the answer by subtracting.
Subtract:
12 − 10 = 2
The missing number is 2.
Which number makes the equation true?
21 + 7 = 19 +__
First, add 21 + 7:
21+7 = 19+?
28 =19+?
Decide which number makes the addition number sentence true. You can subtract to find the answer.
Subtract:
28 − 19 = 9
The missing number is 9.
Which number makes the equation true?
11 + 4 =_____ + 2
First, add 11 + 4:
| 11 + 4 | = | ? + 2 |
| 15 | = | ? + 2 |
Decide which number makes the addition number sentence true. You can subtract to find the answer.
Subtract:
15 − 2 = 13
The missing number is 13.
Let’s practice!🖊️
