Question

jake says that there should be a decimal point in the quotient 142.45 ÷7.4=1925 after the 2.which equation shows the best estimate for the quotient. a. 150÷10=15b. 140÷10=14c. 150÷5=30d. 140÷7=20part buse the drop down menus to explain whether jake is correct.jake correct because 192.5 close to the estimate. the decimal point belongs after the

Answer 1

Decimal division

Part A

We want to divide

142.45 ÷ 7.4

In order to find the best stimate, we round both numbers.

We have that 142.45 can be rounded to 140 or 150, since it is nearer to 140, then we round:

142.45 ≅ 140

Since 7.4 is near to 7, we can approximate it

7.4 ≅ 7

Then

142.45 ÷ 7.4 ≅ 140 ÷ 7

Since 140 ÷ 7 = 20, then

Answer- D

Part B

We have then, that the result for

142.45 ÷ 7.4

must be near to 20 (as we concluded on Part A).

142.45 ÷ 7.4 ≅ 20

Then, if we have 1925, then, the way of placing the decimal point that makes it nearer to 20 is

19.25

Jake says that it is 192.5 but it is farer from 20 than 19.25

Answer- Jake is not correct because 192.5 is far from the stimate. The decimal point belongs after the 9: 19.25