Place Value Patterns
What is the product of 16 x 10?
160
Rewrite 8 x 100 using the associative property
4 x 200 or 800
What would you round each factor to in this expression?
42 x 68
40 and 70
Ms. Pina bought 2 boxes of crayons, each with 30 crayons. How many crayons did she buy?
60 crayons
What is the product of 300 x 50?
15,000
Rewrite 30 x 100 using the associative property
6 x 50 or 3,000
Estimate the product by rounding both factors to the nearest tens:
79 x 31
80 x 30 = 2,400
A cafeteria received 40 cases of juice boxes. If there are 20 juice boxes in each case, how many juice boxes are there in total?
800 juice boxes
What is the product for 80 x 3,000?
240,000
What is the product of 12 x 3 x 100?
3,600
Estimate the product by rounding the multi-digit factor ONLY to the nearest hundred:
584 x 4
600 x 4 = 2,400
Estimate the total number of pencils if 60 students each need 19 pencils
60 x 20 = 1,200
What is the product of 450 x 100?
45,000
14 x 20
2,800
Estimate 4 x 1,987 by rounding the multi-digit factor ONLY to the nearest thousand:
4 x 1,987
4 x 2,000 = 8,000
Ms. Pina's favorite store received 32 bags, each with 200 Takis. How many Takis did the store receive?
6,400 Takis
40 x 70 x 10 is equal to what product?
28,000
Solve the expression 60 x 40 by thinking of it as
(3 x 20) x 40
2,400
Is 52 x 98 ≈ 5,000 a reasonable estimate? Why or why not?
Yes, because 52 rounds to 50 and 98 rounds to 100, and 50 x 100 = 5,000.
Round to the nearest ten to estimate the area of a rectangle that has a length of 48 cm and a width of 32 cm.
50 x 30 = 1,500