Multiply by Tens
Find the product.
20 x 30
60
Estimate:
22 x 46
20 x 50 = 1,000
Multiply using area models and partial products.
12 x 19
228
Use the standard algorithm to multiply.
40 x 34
1,360
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Find the product.
60 x 80
4,800
Estimate:
45 x 57
50 x 60 = 3,000
Multiply using area models and partial products.
23 x 15
345
Use the standard algorithm to multiply.
36 x 28
1,008
There are 3 new seats in each row in a school auditorium. There are 15 rows in the auditorium. Each new seat cost $74. What is the cost for the new seats?
Step 1: 3 x 15 = 45
Step 2: 45 x $74 = $3,330
Find the product.
50 x 40
2,000
Estimate:
82 x 46
80 x 50 = 4,000
Multiply using area models and partial products.
43 x 57
2,451
Use the standard algorithm to multiply.
22 x 65
1,430
Ray and Ella helped move their school library to a new building. Ray packed 27 boxes with 25 books in each box. Ella packed 23 boxes with 30 books in each box. How many more books did Ella pack? Show your work.
Ray: 27 x 25 = 675
Ella: 23 x 30 = 690
690 - 675 = 15
Ella packed 15 more books
Find the product.
20 x 33
660
Estimate:
63 x 74
60 x 70 = 4,200
Multiply using area models and partial products.
68 x 46
3,128
Alex has 21 marbles. Zach has 19 times as many marbles as Alex. How many marbles does Zach have?
399 marbles
A clothing store sells 26 shirts and 22 pairs of jeans. Each item of clothing costs $32. What is a reasonable estimate for the total cost of the clothing?
26 + 22 is about 50. (30 + 20 = 50)
$32 is about $30. 50 × $30 = $1,500
There are 68 boxes of pencils in Ms. Harris’ supply cabinet. Each box contains 100 pencils. How many pencils are in the supply cabinet?
6,800 pencils
Ms. Colón’s class is taking a field trip to the zoo. The trip will cost $36 for each student. There are 21 students in her class. Round each factor to estimate the total cost of the students’ field trip.
$40 x 20 = $800
Multiply using area models and partial products.
88 x 93
8,184
Terrell runs 15 sprints. Each sprint is 65 meters. How many meters does Terrell run?
975 meters
A clothing store sells 26 shirts and 22 pairs of jeans. Each item of clothing costs $32. What is the exact answer for the total cost of the clothing?
26 + 22 = 48
48 × $32 = $1,536