Angles
What do you call an angle that measures less than 90∘?
acute angle
What is the perimeter of a rectangle with length 66 units and width 33 units?
Perimeter = 2×(6+3)=2×9=182×(6+3)=2×9=18 units.
Compute: 24÷3
8
If 6×7=42 what is 42÷7?
6
Multiply: 12×3
36
Name an angle that measures exactly 90∘
Right Angle
Find the area of a rectangle with length 7 units and width 4 units.
Area = 7×4=28 square units.
Compute: 87÷3 (give quotient and remainder if any)
29
Fill in the fact family: 8×9=72, then write the two division facts that belong with it.
72÷9=8 and 72÷8=9
Multiply: 14×6
84
Describe an obtuse angle in terms of degree measure.
An obtuse angle measures greater than 90∘ and less than 180∘
A rectangle has area 36 square units and length 9 units. What is its width?
4 units
Compute: 94÷5 (give quotient and remainder)
18 remainder 4
True or false: If 5×n=35 then 35÷5=n. Explain
True.
Multiply: 23×4.
92
Two rays form an angle that measures 135∘ Is this acute, right, or obtuse? Explain briefly.
135∘ is obtuse because it is greater than 90∘and less than 180∘
The perimeter of a rectangle is 30 units and its length is 8 units. Find its width.
7 units.
Divide: 128÷4
32
Using related facts: if you know 4×6=24, how can you quickly find 24÷4 and 24÷6?
24÷4=6 and 24÷6=4.
Multiply: 36×12.
432
On a diagram, angle A measures 40∘ and angle B is its supplement. Find the measure of angle B and state its classification (acute/right/obtuse).
Angle A = 40∘.
Its supplement B = 180∘−40∘=140∘
Classification: obtuse (since 140∘is between 90∘90∘ and 180∘).
A classroom rug is 12 ft long and 8 ftwide. Calculate both the area and the perimeter.
40 ft.
213÷7 (show quotient and remainder)
30 remainder 3
Given that 12×11=132, list all four facts in that fact family (two multiplication, two division).
Multiply: 47×28.
1,316