Mental Math
What is (81 ÷ 9) + 5?
14
What is a number that is divided by another called?
a dividend
What Roman tool helped with calculations?
Abacus
You bought 3 packs of pencils with 6 pencils each. How many pencils do you have?
18
What is 1/2 of 10?
5
What is (144 ÷ 12) + √81?
21
What do you call a number with no fractional part?
Whole Number
What tool did ancient Egyptians use to measure fields?
Rope With Knots
I’m a number. Double me and add 8, and you get 20. What number am I?
6
What shape is a stop sign?
an octogon
If today is Friday, what day of the week will it be 100 days from now?
Sunday
A repeating pattern of shapes that covers a plane with no gaps or overlaps?
a tesselation
Which mathematician helped put a man on the moon?
Katherine Johnson
What three-digit number has digits that add up to 6, and the middle digit is 0?
105
A palindrome is a number that reads the same forward and backward. For example, 1001 is a palindrome. What is the positive difference between the next palindrome and 1001?
110
A 5-digit code is formed using the digits 1–9, with no repetition. How many such codes are divisible by 5?
Numbers with direction
a vector
Who was the first woman to win a Fields Medal in mathematics?
Maryam Mirzakhani
A drawer contains 6 red, 5 green, and 4 blue socks. If you randomly pick two socks without replacement, what is the probability that both are green?
What is the golden ratio?
1.618...
5-Digit Codes from Digits 1–9, Divisible by 5 (No Repetition)
1680
Sum of their divisors equals the number itself
a perfect number
What is the oldest known mathematical artifact?
The Lebombo bone
Eight years ago, a father was five times as old as his son.
Four years from now, the father’s age will be three times his son’s age at that time.
How old are they now?
father: 68
What is the sum of the angles in a pentagon?
540