Multiply Tens
Solve. 20 x 30
600
solve 12 x 20
240
estimate 12 x 15
10 x 20 = 200
36 x 12
432
A furniture store was selling new chairs for $77 dollars each. If a company bought 41 chairs, how much money would they end up spending?
77 x 41 = 3,157 dollars
1,200
solve 18 x 30
540
estimate. 21 x 34
20 x 30 = 600
12 x 15
180
On her MP3 player, Carol had 27 different singers with 61 songs from each singer. How many songs did Carol have total?
27 x 61 = 1,647 songs
solve. 60 x 80
4,800
750
Estimate 38 x 41
40 x 40= 1,600
32 x 25
800
Baseballs come in cartons of 84 baseballs. A team orders 18 cartons of baseballs. How many baseballs does the team order?
84 x 18 = 1,512 baseballs
solve. 90 x 80
7,200
solve 18 x 80
1,440
84 x 65
80 x 70 =5,600
47 x 38
1,786
At East School, each of the 45 classrooms has an average of 22 students. At West School, each of the 42 classrooms has an average of 23 students. How many more students are at East School than at West School?
East School 45 x 22 = 990
West School 42 x 23 = 966
990-966 = 24 more students
solve. 50 x 40
2,000
solve 23 x 40
920
99 x 82
100 x 80 = 8,000
95 x 82
7,790
Ace Manufacturing ordered 17 boxes with 85 ball bearings each. They also ordered 15 boxes with 90 springs each. How many more ball bearings than springs did they order?
ball bearings 17 x 85 = 1,445
springs 15 x 90 = 1,350
1,445- 1,350 = 95 more ball bearings