Question 26 of 47intermediate🔧 ApplyNumerical6 marks

Find the product by halving and doubling either the multiplier or the multiplicand. 1) 5×185 \times 18 2) 50×2850 \times 28 3) 15×2215 \times 22 4) 25×1225 \times 12 5) 12×4512 \times 45 6) 16×4516 \times 45

(1)
Answer

90

(2)
Answer

1400

(3)
Answer

330

(4)
Answer

300

(5)
Answer

540

(6)
Answer

720

Explanation

(1) Half of 18 is 9, double of 5 is 10, so 9×109 \times 10 = 90 (2) Half of 50 is 25, double of 28 is 56, so 25×5625 \times 56 = 1400 (3) Half of 22 is 11, double of 15 is 30, so 11×3011 \times 30 = 330 (4) Half of 12 is 6, double of 25 is 50, so 6×506 \times 50 = 300 (5) Half of 12 is 6, double of 45 is 90, so 6×906 \times 90 = 540 (6) Half of 16 is 8, double of 45 is 90, so 8×908 \times 90 = 720

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