To the nearest twenty-five, 25
To the nearest ten, 20
20 and 50 don't need an estimate. You can perform any operation on them just they way they are.
20
198 * .20 = 39.6
To estimate 37x22, we can round each number to the nearest tens place, which would be 40 and 20. Then, we can multiply these rounded numbers together to get an estimate. 40 multiplied by 20 is 800. Therefore, the estimate of 37x22 is 800.
24*15 is 360. Why estimate when you can easily get the exact answer?
20 centimeters
15.6
To the nearest ten, 20
20 miles
A more reasonable estimate would be 15.
20.4211