Most people who multiply mentally are using some form of the distributive property. If you wanted to do something like 47 x 5 in your head, that's (40 x 5) + (7 x 5) = 200 + 35 = 235
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Do the 2 x 50 first. Get 100. Multiply that by 14.
Move the decimal point two spaces to the right.
Multiply by ten and add one of the number. 7 x 11 = 70 + 7 23 x 11 = 230 + 23 = 253.
mentally solve whole number multiplication and division problems using: ... Dividing by 8 is like dividing by 2 then 2 then 2 so half 136 is 68 and half 68 is 34 and ... The following questions can be used to elicit discussion about the strategy
The patterns and properties to compute mentally 120 times 30 is the numbers 12 and 3 plus the two 0. Multiply 12 by 3 (36) and add the two 0 (3600).