Using the associative law, we can group the 25 with the 4. 25 x 4 = 100, and 77 x100 = 7700. So 77 x (25 x 4) = 7700
Another way, if the values don't lend themselves to such elegant manipulation, is to spilt the numbers into single-digit factors. Makes for more work but may sometimes be easier than long-multiplication.
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How does adding partial products help solve a multiplication problem
According to the associative property when more than two numbers are multiplied, the order in which the numbers are multiplied will give the same product.
the whole reason is this: multiplication is adding to that number in groups and division is subtracting from a number in groups.
By show the number and add it when it done