Equations
True or False?
30 x 9 = 9 x (3 + 10)
False
Is 13 prime? Why or why not?
Yes, because its only two factors are 1 and itself.
Mrs. Cyphers says there are 3 tens in 230. Mrs. Hamilton says there are 23 tens in 230. Mrs. Cyphers says they’re both right. How can that be so? Explain.
There is a 3 in the tens place so Mrs. Cyphers is correct
230=23 tens because 100= 10 tens so Mrs. Hamilton is also correct
Find the area of an 11 by 18 foot rectangle
198 square feet
What is the missing dimension of a rectangle with a side length of 50 and an area of 200?
4
True or False?
16 x 18 = (16 x 10) + (16 x 8)
True
List 4 composite numbers
4, 6, 8, 10 etc.
Gurnoor saved 4 times more money than his classmate, Beau. Beau saved $40. How much money did Gurnoor save?
$40 x 4 = $160
At the bake sale five 4th graders made $21 and they decided to split it up evenly. How much money should each student get?
21 divided by 5 = 4 R 1 and then they split it up so each student got $4.20
What is the area of a rectangle with side lengths 5 and 30?
150 square units
Fill in the blanks
15 x 10 = ( ____ x 10) + (5 x 10)
10
Explain what makes a number composite.
It must have MORE THAN 2 factors.
Beckett is a business man. He washes windows for extra cash to spend on Roblox. He makes 25 cents for each window he washes. If he washes 10 windows, how much money does he make?
$0.25 x 10 = 250 cents or $2.50
Fill in the blank
50 x ___ = 250
5
Draw an area model and solve the equation 6 x 17=
102
Fill in the blanks
29 x 30 = ( ____ x 30) + (20 x 30)
9
List all the factors for 32 and explain if it is composite or prime.
1, 2, 4, 8, 16, 32
It is composite because it has MORE THAN 2 factors.
One day, Tenley and her friend Helena walked a dog together. They earned $25 and split it evenly. How much money did they each get?
$25 / 2 = $12.50
I have 270 marbles. Sophie said, “You have 3 times as many marbles as I do!” Write an equation to represent this situation.
3 x m = 270
Landon was cleaning his room. He found 17 tiny toy cars and decided to give them to his two friends. Landon divided the 17 tiny toy cars evenly between the two boys. (Which equation shows how things worked out?)
A)17 ÷ 2 = 8 R 1
B)17 ÷ 2 = $8.50
C)17 ÷ 2 = 8 ½
A)17 ÷ 2 = 8 R 1
True or False? If false, put the correct answer:
21 ÷ 4 = 20 R 1
False, 5 R 1
List which of the following are prime and which are composite:
2,4,5,8,9,11,13,16 and 17
Prime: 2, 5, 11, 13, 17
Composite: 4, 8, 9, 16
How many hundreds are in 6,412? (Select two answers)
a) 4
b) 400
c) 64
d) 6,412
a) 4 hundreds
c) 64 hundreds
Fill in the missing numbers in the ratio table:
1 12
2 ____
3 36
____ 60
____ 72
____ 120
11 ____
1 12
2 24
3 36
5 60
6 72
10 120
11 132
Mrs. Cyphers had 7 students each bring in 5 pencils. Mr. Sulfaro had 9 students each bring in 5 pencils. After they collected the pencils, Mrs. Cyphers and Mr. Sulfaro divided them evenly among the two 4th grade classes. How many pencils did each class get?
Mrs. Cyphers = 7 x 5 = 35
412 = 9 x 5 = 45
Together 80 divided by 2 = 40 each