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 Grade 2 and Grade 3.
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.