Subtraction Within 100: Games, Strategies & Worksheet
Subtraction within 100 covers two-digit problems like 72 − 38. Children subtract tens and ones, exchange a ten when needed, or count up from the smaller number.
➖ Play the subtraction within 100 game 🖨️ Printable worksheet
Tricks that make it easier
- Count up from the smaller number: 72 − 38 → 38 + 2 = 40, + 32 = 72, so the answer is 34.
- Subtract the tens, then the ones: 75 − 32 = 45 − 2 = 43.
- Round and adjust: 64 − 29 = 64 − 30 + 1 = 35.
Try these
- 51 − 37 =
Answer
14 - 42 − 20 =
Answer
22 - 98 − 83 =
Answer
15 - 90 − 53 =
Answer
37 - 42 − 42 =
Answer
0 - 87 − 74 =
Answer
13
Common mistakes
- Subtracting the smaller digit from the bigger one in each column (72 − 38 = 46).
- Counting the starting number when counting back.
- Not checking the answer by adding back.
A five-day practice plan
| Day | What to do (10 minutes) |
|---|---|
| Day 1 | Play Subtraction Sprint on this skill for 5–10 minutes. Read the explanation after every mistake. |
| Day 2 | Learn one trick from this page and use it out loud while you play. |
| Day 3 | Print the worksheet and try it without help. Mark it with the answer key together. |
| Day 4 | Play again and try to beat your personal best score or get three stars. |
| Day 5 | Mix it up: try the ⏱️ Timed test, or ask your child to explain the skill to you in their own words. |
Suits 2nd Class and 3rd Class.
Frequently asked questions
What does subtraction within 100 mean?
It means subtracting with numbers up to 100, so the starting number is 100 or less.
How do I check a subtraction answer?
Add your answer to the number you took away. If you get back to the starting number, your answer is right.
Is there a printable worksheet?
Yes. The subtraction within 100 worksheet has 30 questions with an answer key.