A simple calculation method of 7.8 × 10.1

A simple calculation method of 7.8 × 10.1

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7.8×10.1
=7.8x10+7.8x0.1
=78+0.78
=78.78
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Simple calculation method of 72 * 0.18 + 10.4

72×0.81+10.4
=7.2×8.1+10.4
=7.2×8+7.2×0.1+10.4
=57.6+0.72+10.4
=68+0.72
=68.72
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2.5 + 3.25 + 0.75 + 7.5

A: 2.5 + 3.25 + 0.75 + 7.5
=(2.5+7.5)+(3.25+0.75)
=10+4
=14

How to calculate 45 * 18 simply

5 × 9 × 2 × 9 = 9 square (2 × 5) = 81 × 10 = 810