Number Sense
I’m a two-digit number. My digits add to 9 and I’m divisible by 9. What number am I?
18, 27, 36, 45, 54, 63, 72, 81, or 90 (any 2-digit multiple of 9 whose digits sum to 9)
Solve: (3x - 7 = 20)
x = 9
What is 3/4 as a decimal?
0.75
A rectangle has perimeter 50cm and length 15cm. What is its width?
10 cm
I’m thinking of a number. Double it, add 8, and you get 26. What was my number?
9
What is the smallest positive integer that has exactly 12 factors?
60
If (2x + 3 = 17), what is (x)?
x = 10
15% of 240 is what number?
36
What is the area of a triangle with base 12mm and height 9mm?
54 mm2
A train travels 180 km in 3 hours. What is its average speed?
60 km / hr
Find the missing number: 3, 6, 12, 24, __, 96.
48
Simplify: x + 5 - 2x + 3
8 - x or -x + 8
A price increases from $80 to $92.
What is the percent increase?
15%
A circle has radius of 1 cm. Approximately, what is its circumference?
2 x Pi = 2 x 3.14 = 6.28
A bag has 3 red, 5 blue, and 2 green marbles. What is the probability of picking a blue marble?
5 out of 10 marbles or 1/2 or 50%
Two numbers have a sum of 20 and a product of 96. What are the numbers?
12 and 8
Solve: x2 - 49 = 0
x=7 or x=−7
Simplify: 18/24
3/4
The angles in a triangle are in the ratio 2:3:4. What is size of the largest angle?
40 degrees
You flip a fair coin 3 times. What is the probability of getting exactly 2 heads?
3/8
What is the least common multiple (LCM) of 12 and 18?
36
A pattern goes: 2, 5, 10, 17, 26, … What is the next term?
37 (adds 3, 5, 7, 9, 11…)
Which is larger: 5/12 or 3/7 ?
3/7 (3/7 = 36/84 ; 5/12 = 35/84)
A cube has a volume of 27 mm3. What is the length of one edge?
3 mm
A tank is 2/5 full. After adding 18 L, it is 3/5 ) full. What is the tank’s capacity?
90 L
18 L = 1/ 5 of the capacity of the tank. Therefore, 5/5 or a full tank equals 18 x 5 = 90.