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Simple
Multiplication Verification Method
How
do you verify your
multiplication? Here is a simple method.
Always reduce computations to a single digit. 43 x 92o 3956 Add 4 + 3 = 7 Add 9 + 2 = 11 then reduce to a single digit 1 +1 = 2 Multiply 2 x 7 = 14 then reduce to a single digit 1 + 4 = 5 Add 3+9+5+6 = 23 then reduce to a single digit 2 + 3 = 5 Both numbers (5) are equal, therefore multiplication is correct. Another example 358 x 4920 176136
Add 3 + 5 + 8 = 16 then reduce to a single digit 1 + 6 = 7 Add 4 + 9 + 2 = 15 then reduce to a single digit 1 + 5 = 6 Multiply 7 x 6 = 42 then reduce to a single digit 4 + 2 = 6 Add 1+7+6+1+3+6 = 24 then reduce to a single digit 2 + 4 = 6 Both numbers (6) are equal, therefore multiplication is correct. Watch the video |