Question
Use partial products to find the product of 21 x 86.
- 1,806
- 6420
- 1,170
- 6,000
Hint:
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:
. 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 answers are: 1,806, 1,170
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 26 as follows:
Step2: Now we will use the distributive property to multiply this:
Step3: Now we will do simple multiplication of which are as follows:
Step4: Now we have to add these numbers.
=>
So, the answer of the multiplication of 
is
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