Powers of 10
80 x 100
8000
When multiplying 10 x 100, you _____ three zeroes.
Annex
Round to the nearest ten and multiply: 11 x 68
10 x 70 = 700
32 x 11
352
A company took 23 employees on a trip across the country. Each plane ticket cost $31. What was the total cost of the trip?
23 x 31 = 713
30 x 10 =
3000
The answer to a multiplication problem is called a(n) _______
Product
Round to the nearest hundred, then multiply: 27 x 58
30 x 60 = 1800
45 x 42
1890
The department store ordered 25 packages of shirts. Each package had 13 shirts. How many shirts were there in all?
25 x 13 = 325
60 x 40 =
2400
You should ___________ your regroupings to make sure you see them.
Round to the nearest leading digit, then multiply: 31 x 48
30 x 50 = 1500
56 x 18
1008
A local college is offering 17 science classes this semester. Each class has 23 open seats. How many total students can enroll in the class?
23 x 17 = 391
21 x 10 =
210
When multiplying powers of 10, first you multiply the ______ , then annex the zeros.
non-zero numbers
Round to the leading digit and multiply: 46 x 22
50 x 20 = 1000
64 x 80
5120
57 students are given 64 pieces of candy each. How much candy is there in all?
64 x 57 = 3648
90 x 80
7200
What would you do before you begin multiplying the 2 in this problem, and why:
67
x 23
———-
1691
Put a 0 as a place holder as you are moving to the next place value, the 10s place, and have to start writing your answer in that place.
Round to the leading digit and multiply:
67 x 83
70 x 80 = 5600
87 x 95
8265
There are 38 pumpkins in each patch. If there are 67 patches, how many pumpkins are in all?
67 x 38 = 2546