Estimating
x standard algorithm
Division
Area & Volume
100
Lin says the value of 257×63 is about 1,500. Do you agree with Lin?
No, 300x60=18,000 which is much greater than 1,500.
100
628×25
15,700
100
Find the value of the expression 630÷14.
45
100
The area of a rectangular field is 8,320 square yards. The width is 65 yards. How long is the field?
128 yards
200
Estimate the value of the quotient 924÷33.
30 becuase 900÷30 = 30
200
359×63
22,617
200
Find the value of 966÷23.
42
200
Find the missing side length.
7 inches
300
There are 418 students at a school. Han estimates that they each drink about 5 glasses of water each day.
About how many glasses of water do all of the students drink in one day?
2,000 because 400 x 5 =2,000
300
Find the value of 322×41. Use the standard algorithm.
13,202
300
Find 4,252÷34 Use partial quotients.
125 with a remainder of 2.
300
A toolbox is shaped like a rectangular prism. The length is 14 inches and the height is 7 inches. If the volume of the toolbox is 1,176 cubic inches, what is its width?
12 inches