Simple calculation of 17 × 10.5

17×10.5
=17×（10+0.5）
=17×10+17×0.5
=170+8.5
=178.5

How to calculate 17 △ 0.25 △ 6.8

17 divided by (0.25 times 6.8) equals 10

Is there a simple calculation method for 17 / 24 * 25

17/24×﹙24＋1﹚＝17﹢17/24

7.8 * 1.17-7.8 * 0.17 = (simple calculation)

7.8×1.17-7.8×0.17
= 7.8×（1.17 - 0.17）
= 7.8× 1
= 7.8

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