Number Ninjas
Is 4,572 divisible by 3?
Answer: Yes
Reason: 4 + 5 + 7 + 2 = 18, and 18 is divisible by 3.
There are 3 cats and 9 dogs. Find the ratio of cats to dogs?
1/3
The rule for the pattern 5, 7, 9, 11 is ..
+2
A polygon has 5 sides. What is it called?
Pentagon
Is 2 kg of 10-cent coins heavier, or 1 kg of 20-cent coins?
2 kg of 10-cent coins is heavier.
Because 2 kg is heavier than 1 kg, no matter what the coins are.
Plastic forks come in packages of 12 and plastic spoons come in packages of 8. If you want one fork for each spoon at a party with none leftover, what is the least amount of forks and spoons that you need to buy?
Find the LCM of 12 and 8, which is 24.
So you need:
24 forks (2 packs of 12)
24 spoons (3 packs of 8)
Least amount: 24 forks and 24 spoons
There are 20 students in a class that has 12 boys. Write a ratio to compare the number of girls to boys.
2/3
Find the missing numbers in the pattern. 63, 54, ......, 36,27
45
How many edges does a cube have?
12
When it rains, what kind of tree do birds land on?
A wet tree
Max's goal is to practice playing drums for 300 minutes this week. On Sunday he practiced for 127 minutes. On Tuesday he practiced for 38 minutes. How many more minutes does Max need to practice in order to meet his goal?
135 minutes
Tyler ran 2/3 of a mile. Malik ran 3 times as far. How far did Malik run?
2 miles
Rule for 1, 4, 9, 16, 25 .....
n2
A rectangle and a square have the same perimeter of 32 cm.
Which shape has the greater area, and why?
SQUARE
Which hand is it easier to stir coffee with sugar?
The hand holding a spoon
Without full division, determine whether 54,936 is divisible by 6, 8, and 9.
6: even and digit sum = 27
8: last three digits 936 ÷ 8 = 117
9: digit sum 27
Divisible by all three
The number on the bottom of a fraction is called what?
denominator
Rule 3n − 2, find 6th term
16
Which has more diagonals: a pentagon or a hexagon?
Hexagon
Can an ostrich say, ‘I belong to birds’?
No, because it can’t talk.
The greatest common factor of 10, 50, and 100.
10
Charlotte bought 16 songs. 3/4 of the songs are pop songs. How many songs are pop songs?
12 songs
Rule n² − n
Find 5th term
20
What is the difference between a radius and a diameter of a circle?
d = 2 r
There are 10 candles on a cake. If you blow out 4 of them, how many are left?
10 will be left — 4 are blown out, 6 are still burning.