basic facts
Find 800 × 6
4800
Estimate the product 8 × 939.
8 x 900 = 2700
Use the area model and partial products. Enter your answer in the box.
7 × 330
2,310
Find the partial products and the product.
6 × 1,315
1,315
x. 6
30=(6x5)
60=(6x10)
1,800=(6x300)
6,000=(6x1,000)
7,8090
Sally said she used partial products to write 9 × 602 = 5,400 + 180.
Is Sally correct? Explain.
No
602
x 9
18= (9x2)
5400=(9x600)
5,418
When you multiply 20 × 50, how many zeros are in the product?
3
20 x 50 = 1000
Which is the best estimate of the product 3,780 × 2?
4,000 x 2 = 8,000
There are 1,760 yards in a mile. Mary walked 4 miles. How many yards did she walk?
7,040 yards
Which are the correct partial products of 4 × 3,862?
a) 8; 240; 320; 1,200
b) 8; 240; 3,200; 1,200
c) 8; 24; 3,200; 12,000
d) 8; 240; 3,200; 12,000
b
There are 70 children each, in grades 3, 4, 5, and 6. How many children are there in all 4 of these grades?
70x4=280 children
40 × _____= 2,800
70
92 × 36 rounds to _______ × 40 =
90 x 40 = 3,600
What is 1,736 × 8?
13,888
Noriko multiplies 13 × 45. Which of the following is NOT a partial product?
a)50
b)90
c)15
d)400
b) 90
Larry says 5 × 900 is less than 5 × 9,000. Doni says 5 × 900 is greater than 5 × 9,000.
Which statements about the two products are correct?
a)5 × 900 is 5 groups of 900 or 4,500.
b)5 × 9,000 is 5 groups of 9,000 or 4,500.
c)5 × 9,000 is 5 groups of 9,000 or 45,000.
d)5 × 900 is less than 5 × 9,000.
e)5 × 900 is greater than 5 × 9,000.
a, c, d
A library has 40 shelves. Each shelf has 50 books. Write and solve an equation to find the total
number of books on the shelves.
40 x 50 = 2,000 books
A new computer costs $865. About how much would 11 computers cost?
about 9,000
What is 39 × 17?
663
How can the Distributive Property be used to find
7 × 391? Choose all statements that apply.
a)7 × 391 = 7 × (300 + 90 + 1)
b)7 × 391 = 7 + (300 + 90 + 1)
c)7 × 391 = (7 × 300) + 90 + 1
d)7 × 391 = (7 × 300) + (7 × 90) + (7 × 1)
e)7 × 391 = 2,100 + 630 + 7
a,d,e
Alice’s father walks about 475 steps per lap around a track. Alice walks about 635 steps per lap.
If they each walk 6 laps, about how many more steps does Alice take than her father?
500x6=3,000
600x6 = 3,600
3,600 - 3,000 = 600
600 more steps
Jon wrote a whole number ending in 5 zeros. If he multiplies the number by 100, how many zeros should be in the product?
2 zeros
An office bought 4 boxes of pencils. Each box has 98 pencils. What number sentence can be used to estimate the total number of pencils purchased?
4 x 100 = 400
Which costs more: 17 candy bars that cost 79 cents each or 21 candy bars that cost 65 cents each?
How much more?
17x79 = 1,343
21x65 = 1,365
1,365 - 1,343 = 22 more
Which of the following would be calculated in the process of finding the product of 1,485 × 7? Select all that apply.
a)35
b)56
c)2,800
d)70
e)280
f)7,000
a) 35
c) 2,800
f)7,000
Devina made a quilt using 142 pieces of fabric. She used 4 times as many fabric pieces to make a second quilt. For her third quilt, she doubled the number of fabric pieces that she used in her second quilt.
How many fabric pieces did she use in the third quilt?
1,136 pieces of fabric