🔬 Grade 4 📖 Operations 🎯 Mental Math Strategies

Miss Brenda’s Grade 4 Math Class 🌟

70 practice questions included

Free lessons: 1 of 5

🧠 Practice Questions 70 total

What is a good mental math way to add 47 + 36?

Explanation: Break 36 into 30 + 6, add 47 + 30 = 77, then +6 = 83.

To add 59 + 28 mentally, best strategy is:

Explanation: Add 30 then subtract 2 (compensation).

59 + 41 = ? Use mental math.

Explanation: 59 + 41 = 100 (makes a nice round number).

What is 48 + 35 using mental math?

Explanation: 48 + 35: 48 + 30 = 78, +5 = 83.

Best mental way for 67 - 29:

Explanation: Subtract 30 then add 1 back (compensation).

84 + 19 mentally is:

Explanation: 84 + 20 - 1 = 103 (compensation).

What is 125 + 75 using mental math?

Explanation: 125 + 75 makes 200 easily.

Best strategy for 56 + 38:

Explanation: Add 40 then subtract 2.

93 - 47 mentally:

Explanation: 93 - 50 + 3 = 46 (compensation).

What is 68 + 57 using friendly numbers?

Explanation: 68 + 57: 70 - 2 + 57 = 125 or break apart.

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