medal
First, multiply the numbers to find the exact answer. Then front-end round the numbers and use estimation to determine whether the product is reasonable.
89.41
✕ 7.64
calculated ?
estimated ?

Question

medal
First, multiply the numbers to find the exact answer. Then front-end round the numbers and use estimation to determine whether the product is reasonable.
89.41
✕  7.64
calculated    	? 
estimated    	?

anonymous · Answer

calculated = 683.0924 i dont understand estimated

anonymous · Answer

anyone please help me

mathstudent55 · Answer

89.41 is close to 90
7.64 is close to 8
Estimate 8 times 90
8 times 9 is 72, so 8 * 90 = 720
720 is a high estimate of the product since both numbers were rounded up, but 720 is reasonable.

anonymous · Answer

okay but how would you round the calculated answer

mathstudent55 · Answer

Both 683 and 720 rounded to the nearest 100 are 700, so the estimate is reasonable.

anonymous · Answer

ok thank you :)

mathstudent55 · Answer

You're welcome.