Arrays
What is 4 rows times 6?
24
2x10
20
22x5
110
12 × 4 = ? Show how to solve using partial products.
10 × 4) + (2 × 4) = 40 + 8 = 48
Isabelle has 9 ant farms. Each ant farm has 99 ants.
Which of the following shows a reasonable estimate of how many ants Isabelle has?
A) 7 × 125 = 875
B.) 8 × 110 = 880
C.) 9 × 100 = 900
D.) 10 × 100 = 1,000
C
How much is 8 rows times 10?
80
4x50
200
34 x3
102
What are the partial products for 243 × 3?
200×3 = 600, 40×3 = 120, 3×3 = 9 → 729
Miriam can put 28 books on a shelf. What is the best estimate of the amount of books she can put on 8 shelves?
A) 300 books
B) 260 books
C) 240 books
D) 160 books
C
How much is 6 rows times 20 ?
120
9x400
3600
Which partial product will help you find the product 4 x 205?
a) 4 x20 and 4x5
b) 4 x200 and 4 x50
c) 4x2 and 4x 50
d)4 x200 and 4x5
Estimate 6 fourth grade classes with 28 students in each class. About how many kids are there in total?
180
A bus holds 54 people. How many people can 3 buses carry?
3×54 = 162 people
How much is 8 rows times 30?
240
To find 3 x 800, multiply 3x8 then add how many zeros?
2
Which is the same as 7 x 57?
a) 35 + 49
b) 350 +49
c) 350 + 490
d) 7 + 57
B
Find 356 × 4 using partial products.
300×4 = 1200, 50×4 = 200, 6×4 = 24 → 1424
Each of the 109 fourth graders will need 3 notebooks this school year.
What is the total number of notebooks the fourth graders will need this year?
327 notebooks
A shark has 3 rows of teeth. If the shark has 100 teeth in each row, how many teeth does it have in total?
300
Michelle wrote a whole number ending in 4 zeros. If she multiplies the number by 10, how many zeros should be in the product?
5
99 x 6
594
A box of pens holds 196 pens. There are 6 full boxes of pens in the school supply room. Show the best way to use rounding to estimate the total number of pens in the school supply room?
200 x 6 =1,200
The high school marching band has 339 band members. Each band member is asked to pay $8 for transportation. How much is the amount of money collected to pay for band transportation?
$2,712