Mathematics
Grade5
Easy

Question

Alyssa eats 39 sandwiches every day. After 15 days, the total sandwiches will Alyssa eat in all is?

  1. 585
  2. 642
  3. 170
  4. 612

hintHint:

In this question is that Alyssa eats 39 sandwiches every day and we have to calculate how many sandwiches she eat in 15 days and for that we have to multiply two digit number. We can use the distributive law to do this question. Distributive law relates multiplication and addition as follows: 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: 585



    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 39 as follows:
    15 cross times 39 equals 15 cross times left parenthesis 30 plus 9 right parenthesis

    Step2: Now we will use the distributive property to multiply this:
    15 cross times left parenthesis 30 plus 9 right parenthesis equals 15 cross times 30 space plus space 15 cross times 9
    Step3: Now we will do simple multiplication of which are as follows:
    15 cross times 30 equals 450
    15 cross times 9 equals 135
    Step4: Now we have to add these numbers.
    15 cross times 30 space plus space 15 cross times 9 space equals space 450 plus 135
    =>585
    So, the answer of the multiplication of 15 cross times 39 equals 485 space

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