⭐ 1st Grade · Free printable

Addition and Subtraction Within 100 Worksheets

These worksheets mix addition and subtraction with numbers up to 100, including two-digit plus one-digit problems like 7 + 92. No problem needs regrouping.

Mixing the operations means children have to read each sign and think about place value every time, instead of following a routine. It is a good check before moving on to regrouping.

Print a free worksheet

Choose how many problems. Every worksheet has new problems and a matching answer key.

Opens in a new tab, ready to print. Use the Answer Key button there to print the answers.

Sample problems

  1. 48 − 7 = _____
  2. 64 − 1 = _____
  3. 89 − 41 = _____
  4. 40 + 45 = _____
  5. 11 − 11 = _____
  6. 95 − 41 = _____
  7. 30 + 13 = _____
  8. 89 − 69 = _____

Worked example

7 + 92

  1. 7 is a one-digit number, so it only has ones.
  2. Add it to the ones of 92: 2 + 7 = 9.
  3. The 9 tens stay the same.
  4. So 7 + 92 = 99.

Common mistakes

  • Adding a one-digit number to the tens, so 7 + 92 becomes 162. Lining the numbers up by place value fixes this.
  • Mixing up + and − partway down the page. Circle the signs first.

Tips for practicing at home

  • Ask for an estimate before solving: "Will the answer be more or less than 92?"
  • Write problems in columns on graph paper.
  • Use the printable answer key so your child can check their own work.

Common Core standards

1.NBT.C.4
Add within 100, including a two-digit number and a one-digit number, using strategies based on place value.
1.NBT.C.6
Subtract multiples of 10 in the range 10–90.

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