🚀 Grade 3 📖 Mental Math Strategies 🎯 Mental Math Strategies

Mental Math Strategies | Grade 3 Math

70 practice questions included

Free lessons: 1 of 5

🧠 Practice Questions 70 total

What is 8 + 7? Use doubles or make 10.

Explanation: 8 + 7 = 15 (7 + 7 + 1 = 15).

Miss Kashef thinks: 9 + 6. She makes 10. What is the answer?

Explanation: 9 + 6 = 15 (9 + 1 + 5 = 15).

Use compensation: 47 + 29. What is a good mental way?

Explanation: 47 + 30 = 77, then subtract 1 = 76.

What is 8 + 8 + 8? Use doubles.

Explanation: 8 + 8 = 16, + 8 = 24.

Miss Kashef calculates 35 + 48 mentally. What is the sum?

Explanation: 35 + 50 = 85, then subtract 2 = 83.

What is 9 + 5? Use near doubles.

Explanation: Double 5 is 10, add 4 more = 14? Wait, 9 + 5 = 14 (10 -1 + 5 = 14).

Break apart: 26 + 37. What is the sum?

Explanation: 20+30=50, 6+7=13, total 63.

Miss Kashef uses: 58 + 29. Add 2 to make 60, then adjust. Answer?

Explanation: 58 + 30 = 88, subtract 1 = 87.

What is 7 × 8? Use doubles.

Explanation: 7 × 8 = 56 (7 × 4 × 2).

Miss Kashef thinks 45 + 39. Make friendly numbers. What is the sum?

Explanation: 45 + 40 = 85, subtract 1 = 84.

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