Definitions
What is an array?
A drawing of the rows and columns you are multiplying.
Mrs. Summers works 38 hours a week. What is a good expression to show an ESTIMATE of how many hours she will work in 1 year. One year is 52 weeks.
40 x 50 = 2000
60 x 36 =
2,160
77 x 54 =
80 x 50 = 4,000
13 x 25 =
325
Partial Products
Parts of the answer to a multiplication problem.
In a movie theater there are 24 rows of 15 seats. How many seats are in the theater?
24 x 15 = 360
16 x 20 =
320
89 x 63 =
90 x 60 = 5,400
33 x 15 =
495
Product
A play sells 60 tickets for every show. The show goes on 40 times. How many tickets did the theater sell?
60 x 40 = 2400
50 x 22 =
1,100
91 x 53 =
90 x 50 = 4,500
21 x 35 =
735
Estimate
A number close to enough to the right answer.
Owen hikes every month. Last month he hiked 13 miles, 12 times. This month he hiked 12 miles, 13 times. How many miles did he hike last month?
13 x 12 = 156
19 x 30 =
570
25 x 63 =
30 x 60 = 1,800
61 x 44 =
2,684
Rounding
To make a number a simpler value.
Lily gets paid $25 to mow the lawn. If she mows it 25 times this summer how much can she earn?
25 x 25 = 625
70 x 60 =
4,200
14 x 65 =
10 x 70 = 700
11 x 66 =
726