Question

Estimate the product by first rounding the given number to the nearest ten
77*87

Answer 1

7,200

Explanation:

So you have 77 x 87

Round 77 ( look at the ones place, is it 5 and up? In this scenario it is. So you want to go up one in the tens place and replace the 7 with a 0 in the ones place) Which looks like this: 80

Do the same thing with the number 87

You should get 90

So now you have 80 x 90

If you want to solve without a calculator you should know your multiplication such as 4 x 5 which is obviously 20

In this scenario remove the zeros

8

x 9

___

72

Now add the total number of zeros from both numbers which there are 2 zeros in total. Add the 2 zeros to the total of 8 x 9.

And you should get 7,200

Hope this makes sense!

Answer 2

7200

Explanation:

Step 1:

77 × 87 Round

Step 2:

80 × 90 Multiply

Answer:

7200

Hope This Helps :)