Quick Facts
What is the value of the expression below?
5,280 x 6
31,680
What is the best estimate answer for 39 x 41?
a. 1200
b. 160
c. 1600
d. 1599
40 x 40 = 1600
Estelle had 28 coins in her collection. Fred had 4 times as many coins as Estelle had. Which equation can be used to determine the coins Fred has?
a. 28 x 4 = __
b. 28 + 4 = __
c. 28 - 4 = __
d. 28 divided by 4 + __
28 x 4 = __
How can you solve 21 x 13 by decomposing 13?
21 x 10
21 x 3
What is the name for the answer of an addition problem?
Sum
200 x 2 =
400
First five multiples of 5:
ex.) 5 x 1, 5 x 2...
5, 10, 15, 20, 25
Therefore, 5 is a factor of 25 and a multiple of 5.
A store ordered 28 boxes holding 12 banana muffins each and 5 boxes holding 6 blueberry muffins each. Which equation shows the total number of muffins the store ordered?
a. (28 x 12) x (5 x 6) = m
b. (28 + 12) x (5x6) = m
c.) (28 x 12) + (5x6) = m
d. (28 + 12) + (5 +6) = m
c. (28x12) + (5x6) = m
3 times the amount of 36 is?
108
Jenny drove 45 miles on Monday. She drove 3 times that amount on Tuesday. How many miles did she drive on Monday AND Tuesday?
45 x 3 = Tuesday
Monday: 45
Tuesday: 135
135 + 45 for total miles she drove on Monday and Tuesday
180 miles
13 x 5 =
95
Estimate 41 x 38 and solve for the estimation
40 x 40 = 1600
Which statement represents this equation 15 x 5 = 75
a. The number 15 is 5 less than 75
b. The number 15 is 5 times as many as 75
c. The number 75 is 5 times as many as 15
c. The number 75 is 5 times as many as 15
4 times 15 equals what?
60
Sam, Clara, and Jim painted a tree house.
Sam Spent 2 times as many minutes painting as clara. Clara spent 30 more minutes painting than Jim. Jim 45 minutes. What is the total number of minutes they all spent painting?
Jim: 45 mins
Clara: 45 + 30 more.. = 75
Sam: 2 times as clara... 2 x 75 = 150
Add total sums: 45, 75, 150 = 270 minutes painting a tree house
71 x 91=
6461
Use mental math to solve
8 x 5
8 x 50
80 x 50
8 x 500
8 x 5,000
45
450
4500
4500
45000
A school has 17 tables in the cafeteria. Each table seats 12 students. What is the greatest number of students that can be seated at the tables?
a. 114
b. 184
c. 194
d. 204
d. 204
7 x 5 =
35
Alex bought 2 printer cartridges for $28 EACH and a printer for $85. He gave the cashier $150. How much change should he receive back?
Think about each step you need to do before the answer..
Each means multiply.
28 x 2 = 56 printer c.
$56 + $85 = 141 he spent...
Gave cashier 150 so 150 - 141 = $9 he should receive in change
What is the value of the expression below?
46 x 27
1,242
What is the best estimate for 25 x 27
a. 900
b. 600
c. 1700
d. 1800
There are 20 students in Mr. Clark's fourth grade class. There are 5 times as many students in the entire fourth grade as there are in Mr. Clark's class.
Write an equation to solve this problem
20 x 5 = N
N= (Number of students in all of 4th grade)
90 x 4=
360
First three Multiples for 7:
Remember example of multiples are
7 x 1 , 7 x 2 , 7 x 3
7, 14, 21