Method for multiplying numbers where the first figures are same and the last figures add to1 0
42 x 48 =
Both numbers here start with 4 and the last figures (2 and 8) add up to 10. just multiply 4 by 5 (the next number up) to get 20 for the first part of the answer.
And we multiply the last figures: 2 x 8 = 16 to get the last part of the answer
And we multiply the last figures: 2 x 8 = 16 to get the last part of the answer
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