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📝 Adding Within 100: Practice B (1.NBT.C.4)

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Add within 100, including a two-digit and a one-digit number, and a two-digit number and a multiple of 10. Solve each problem.

1. 41 + 20 = ___
2. 66 + 8 = ___
3. 24 + 50 = ___
4. 11 + 1 = ___
5. 84 + 10 = ___
6. 21 + 7 = ___
7. 76 + 20 = ___
8. 23 + 9 = ___
9. 26 + 30 = ___
10. 76 + 3 = ___
11. 34 + 20 = ___
12. 12 + 7 = ___
Answer key: 1) 61 · 2) 74 · 3) 74 · 4) 12 · 5) 94 · 6) 28 · 7) 96 · 8) 32 · 9) 56 · 10) 79 · 11) 54 · 12) 19
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Worksheets › Grade 1 Math › Adding Within 100 › Adding Within 100

Grade 1 (ages 6–7)Numbers & mathsFree printable PDF

About this grade 1 worksheet

Free Grade 1 math worksheet (Common Core 1.NBT.C.4): adding within 100 — a second set of twelve practice problems, with answer key. Skill: Add within 100, including a two-digit and a one-digit number, and a two-digit number and a multiple of 10. Level: Grade 1 — also suits Year 2 (UK).

For teachers: skills & standards

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What age is it for?

It is designed for Grade 1 (ages 6–7), but use it with any child who is ready.

What skills does it build?

Add within 100, including a two-digit and a one-digit number, and a two-digit number and a multiple of 10.

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More “Adding Within 100” printables (1.nbt.c.4: add within 100, including a two-digit and a one-digit number, and a two-digit number and a multiple of 10)

Adding Within 100: Practice A (1.NBT.C.4) · Adding Within 100: Word Problems (1.NBT.C.4) · Adding Within 100: Show Your Thinking (1.NBT.C.4) · Adding Within 100: Quick Check (1.NBT.C.4)

All 5 adding within 100 sheets → · Grade 1 Math: all 10 skills → · All Common Core grades

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