Mathematics
Grade5
Easy

Question

32 x 21 = _____.

  1. 500
  2. 672
  3. 100
  4. 600

hintHint:

In this question we have to multiply as two-digit number with a two-digit number. We can use the distributive law to do this question. Distributive law relates multiplication and addition as follows:a left parenthesis b plus c right parenthesis equals left parenthesis a cross times b right parenthesis plus left parenthesis a cross times c right parenthesis. This law shows that first adding some numbers and the multiplying the sum by some numbers gives same result as first multiplying each number by separately with the number and then adding them

The correct answer is: 672



    Step by Step Solution:
    Step1:
    we have to use the standard algorithm to find the multiplication so we will first break the one number into small numbers that can be easily multiplied to get the result. So, we will divide 21 as follows:
    32 cross times left parenthesis 21 right parenthesis space equals space 32 space cross times left parenthesis 20 plus 1 right parenthesis
    Step2:
    Now we will use the distributive property to multiply this:
    32 cross times left parenthesis 20 plus 1 right parenthesis equals left parenthesis 32 cross times 20 right parenthesis plus left parenthesis 32 cross times 1 right parenthesis
    Step3:
    Now we will do simple multiplication of left parenthesis 32 cross times 20 right parenthesis space space space a n d space space left parenthesis 32 cross times 1 right parenthesis space spacewhich are as follows:
    32 cross times 20 space equals space 640
space 32 cross times 1 equals space 32

    Step4:
    Now we have to add these numbers.
    left parenthesis 32 cross times 20 right parenthesis space space plus space left parenthesis 32 cross times 1 right parenthesis equals 640 plus space 32
equals greater than space 672
    So, the answer of the multiplication of 32 cross times 21 space equals space 672

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