Grade 8 Math: Order of operations

1. 1.A) 720Multiply both pairs first: 15 × 18 = 270 and 25 × 18 = 450, then add.
2. 2.C) 72Innermost brackets first: 4 − 1 = 3, then add 3, then multiply by 12.
3. 3.C) 121Brackets first: 31 − 9 = 22, then square, then divide by 4.
4. 4.D) 16 + 15 × 7The product 15 × 7 = 105, so the value is 121.
5. 5.C) 379Multiply both pairs first: 17 × 17 = 289 and 18 × 5 = 90, then add.
6. 6.A) 105Innermost brackets first: 7 − 2 = 5, then add 10, then multiply by 7.
7. 7.A) 27Brackets first: 25 − 16 = 9, then square, then divide by 3.
8. 8.B) 7 + 18 × 5The product 18 × 5 = 90, so the value is 97.
9. 9.B) 158Multiply first: 7 × 20 = 140, then add 18.
10. 10.A) 160Innermost brackets first: 13 − 5 = 8, then add 8, then multiply by 10.

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