Addition & Subtraction to 99
Solve addition and subtraction problems up to 99
Adding and Subtracting to 99 ➕➖
We can add (put together) and subtract (take away) numbers up to 99. When we add, the answer gets bigger. When we subtract, the answer gets smaller.
Example
Addition Examples
23 + 14 = ?
Tens: 20 + 10 = 30
Ones: 3 + 4 = 7
Answer: 30 + 7 = 37 ✅
45 + 32 = ?
Tens: 40 + 30 = 70
Ones: 5 + 2 = 7
Answer: 70 + 7 = 77 ✅
Example
Subtraction Examples
56 − 23 = ?
Tens: 50 − 20 = 30
Ones: 6 − 3 = 3
Answer: 30 + 3 = 33 ✅
89 − 45 = ?
Tens: 80 − 40 = 40
Ones: 9 − 5 = 4
Answer: 40 + 4 = 44 ✅
Note
Remember 💡
Break the numbers into tens and ones. Add or subtract the tens first, then the ones. Check your answer by counting on your fingers or using objects!
Key Vocabulary
AdditionPutting numbers together to get a bigger number
SubtractionTaking away to get a smaller number
SumThe answer when we add
DifferenceThe answer when we subtract
TensGroups of 10
OnesSingle units
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