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1) Quick tutorial: carry the 1 🔄
When the ones add to 10 or more, regroup 10 ones as 1 ten.
How it works:
7 ones + 8 ones = 15 ones.
Write 5 ones. Carry 1 ten.
Then 2 tens + 1 carried ten = 3 tens.
2) Warm-up sums 🌟
Solve these vertical addition problems. Each one needs regrouping.
3) Two-digit plus two-digit 🐝
Add carefully. First add ones, then regroup if needed.
Answers: 2) 35, 23, 43, 33, 51 | 3) 45, 61, 63, 72, 53
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4) Add and check 📦
Solve the sum, then whisper the answer to a friend or teacher to check.
5) Missing addend challenge 🧩
Find the missing number.
34 + ☐ = 52
☐ + 18 = 47
29 + ☐ = 63
☐ + 16 = 81
6) Sort the sums 🎈
Write each answer, then decide: is it less than 70 or greater than 70?
- 48 + 16 = → less than 70 / greater than 70
- 37 + 28 = → less than 70 / greater than 70
- 56 + 19 = → less than 70 / greater than 70
- 68 + 15 = → less than 70 / greater than 70
Answers: 4) 73, 77, 82, 82, 91 | 5) 18, 29, 34, 65 | 6) 64 less than 70; 65 less than 70; 75 greater than 70; 83 greater than 70