Multiplication Comparison
There are 9 students in the art club. There are 4 times as many students in chorus. How many students are in chorus?
36
To find 7 x 23, is it easier to break apart the factor 23 as 20 +3 or 15 +8? Explain.
20 + 3 because I can use mental math to multiply by multiplies of 10.
Alex has 17 baseball cards. Rodney has 3 times as many as Alex. How many fewer cards does Alex have than Rodney?
Write the full equation then solve.
(17 x 3) - 17 = b
b = 34
Which number could be a partial product for the equation 3 x 15?
a. 8 b. 150 c. 30 d.13
c
Use your best strategy to solve 3 x 245.
735
Write a comparison sentence. 5 x 7 = 35
5 times as many as 7 is 35
Use distributive property to find the product of 4 x 14.
(4 x 10) + (4 x 4) = 56
Kevin has 5 fish in his fish tank. Jasmine has 4 times as many fish as Kevin. 2 of Jasmine's fish die. How many fish does Jasmine have left?
Write the full equation then solve.
(5 x 4) - 2 = f
f = 18
Which number could be a partial product for the equation 4 x 27?
a. 21 b. 280 c. 28 d.800
c
Use your best strategy to solve 6 x 457
2,742
Maria's dog weighs 6 times as much as her rabbit. Together the pets weigh 56 pounds. What does Maria's dog weigh?
48
Maria makes bead necklaces. Beads are packaged in bags of 50 and bags of 200. Mariah bought 4 bags of 50 and 3 bags of 200 beads. How many beads did Mariah buy?
800
It will cost $73 per hour to rent a sailboat and $88 per hour to rent a ski boat. How much more will it cost to rent a ski boat than a sailboat for 4 hours?
Write the full equation then solve.
(88 x 4) - (73 x 4) = n
n = 60
Which number could be a partial product for the equation 6 x 357?
a. 180 b. 30 c. 40 d. 300
d
Use your best strategy to solve 3 x 2,340.
7,020
Ben saw 5 times as many robins as cardinals while bird watching. She saw a total of 24 birds. How many more robins did she see than cardinals?
16
Use expanded form to find 4 x 213.
4 x 200 10 3
800 40 12
800 + 40 + 12 = 852
Allie is building a patio. The patio will have 8 tiles in each of 13 rows. She has already built the center section with 4 tiles in each of 7 rows. How many more tiles are needed to complete the patio?
Write the full equation then solve.
(8 x 13) - (4 x 7) = p
p = 76
Which number could be a partial product for the equation 3 x 1,200?
a. 1200 b.0 c. 60 d. 300
b
Use your best strategy to solve 7 x 1,395
9,765
Sue scored a total of 35 points in two games. She scored 6 times as many points in the second game as in the first. How many more points did she score in the second game?
25
Using partial products, find the missing digit.
__ 5 x 7 = 455
65 x 7 = (5 x 7) (60 x 7)
35 420
35 + 420 = 455
Mr. Jackson has $5,400 to buy supplies for the school computer lab. He buys 8 boxes of printer ink that cost $149 each and 3 printers that cost $1,017 each. How much money will Mr. Jackson have left after he buys the printer ink and printers?
5,400 - (8 x 149) + (3 x 1,017) = p
p = 1,157
Which number could be a partial product for the equation 4 x 3,425?
a. 12,000 b. 800 c. 25 d. 160
a
Use your best strategy to solve 8 x 3,489
27,912