Ex plane how knowing 50 x 4 = 200 helps you find 500 x 400

U count how many zeros are in each of the problems then u multiply the whole number and add the zeros to the end

example 500 x 400 = 200000 because 5 x 4 is 20 and 500 and 400 have 2 zeros each so u add 4 zeros to 20 so 200000

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Imade the graphics for all of them so check which one is the same as in your pic