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NUMBER NINJA
NUMBER NINJA
Estimate the product:
625 × 34
Round each number to a convenient place value first.
21,000
⏱️ SPEED ROUND!
Add
1/4 + 2/4
Simplify your answer.
3/4
Find the area:
Width = 5 feet
Length = 7 feet
35 ft2
Find the GCF of:
18 and 54
18
Write the prime factorization of:
40
2³ × 5
Calculate:
104 × 59
6,136
Subtract:
5/6 − 1/3
1/2
Find the area:
Width = 8 feet
Length = 9 feet
72 ft2
Find the GCF of:
36 and 84
12
POINT WAGER
Are these expressions equivalent?
5 × (17 × 2)
and
(5 × 2) × 17
Explain why or why not.
Yes, the expressions are equivalent because multiplication is associative and commutative.
DOUBLE POINTS
Round 4,472,819 to:
the nearest hundred thousand
the nearest million
nearest hundred thousand: 4,500,000
nearest million: 4,000,000
A camper needs 1/6 yard of fabric for each project.
How much fabric is needed for 40 campers?
6 2/3 yards
A rectangle has an area of 28 square units.
Name all the possible whole-number side lengths.
1 × 28
2 × 14
4 × 7
Find the LCM of:
8 and 12
24
Use the Distributive Property to rewrite:
18 + 28
18 + 28 = 2(9 + 14) is one valid distributive-property rewrite.
Round 26,738,932 to:
the nearest hundred thousand
the nearest million
nearest hundred thousand: 26,700,000
nearest million: 27,000,000
Ling has 6 2/3 yards of fabric. She needs 1/6 yard for each of 40 campers.
Does she have enough fabric?
Show your thinking!
Ling has exactly enough: 6 2/3 yards
PASS THE QUESTION
A square has a side length of 6 inches.
1. What is its area?
2. What is its perimeter?
3. Is its perimeter less than 30 inches?
◦ Area: 36 in2
◦ Perimeter: 24 in
◦ Yes, it is less than 30 inches.
Find the LCM of:
6 and 9
18
List all the factor pairs for:
18
Then list all the factor pairs for:
28
What factor do they have in common?
Common factors of 18 and 28 include 1 and 2
You have 20 seconds:
Which is a better estimate for 625 × 34?
A. 2,000
B. 20,000
C. 200,000
B. 20,000
What is:
4 2/3 ÷ 2 1/2
28/15 = 1 13/15
Draw an area model for 18.
Name all the factor pairs you can use.
1 × 18
2 × 9
3 × 6
TEAM UP!
Write the prime factorization of:
28
2² × 7
Which expression is equivalent to:
(5 × 17) + (5 × 2)
A. 5 × (17 + 2)
B. 5 + (17 × 2)
C. (5 + 17) × 2
A. 5 × (17 + 2)