Vocab
the result of using lesser numbers to estimate a sum or product
underestimate
Estimate to nearest hundred 207 x 2
200 x 2 = 400
6.2 x 7
43.4
5.4 x 8.2
44.28
2.7 x 1.6
4.32
the result of using greater numbers to estimate a sum or product
overestimate
Estimate to nearest hundred: 413 x 30
400 x 30 = 12000
8.5 x 3
25.5
2.78 x 3.1
8.618
5.9 x 4.5
26.55
a letter that represents a number in an equation or expression
variable
Estimate to the nearest thousand: 1123 x 41
1000 x 41 = 41,000
6.4 x 12
76.8
4.27 x 5.9
25.193
7.4 x 6.32
46.768
products found by breaking one of two factors into ones, tens, hundreds, so on, and then multiplying each of these by the other factor
Estimate to the nearest hundred 512 x 22
500 x 22 = 11,000
42 x 3.4
142.8
92.53 x 4.62
427.4886
231.4 x 26.32
6,090.448
Which way do you move the decimal place in the answer?
TO THE LEFT
Estimate to the nearest thousand 4567 x 20
5000 x 20 = 100,000
52.63 x 15
789.45
632.4 x 23.55
14,893.02
2.53 x 7.98
20.1894