Math CH1-2 Reviewer

A number is divisible by 2 when…

• the number is even
• the sum of a digits is divisble by 3
• the last 2 digits are divisible by 4 or both zeroes
• the number ends in 0 or 5

A number is divisible by 3 when…

• the sum of a digits is divisible by 3

• the number is even
• the sum of a digits is divisible by 9

• the last 2 digits are divisible by 4 or both zeroes

A number is divisible by 4 when…

• the last 2 digits are divisible by 4 or both zeroes
• the sum of a digits is divisble by 3
• the number is even
• the sum of a digits is divisble by 3
• the last 2 digits are divisible by 4 or both zeroes

A number is divisible by 5 when…

• the number ends in 0 or 5
• the last 2 digits are divisible by 4 or both zeroes
• the sum of a digits is divisble by 3
• the number is even
• the sum of a digits is divisble by 3

A number is divisible by 6 when…

• the number is even AND divisible by 3
• the number ends in 0 or 5
• the last 2 digits are divisible by 4 or both zeroes
• the sum of a digits is divisble by 3
• the number is even

A number is divisible by 9 when…

• the sum of the digits is divisible by 9
• the number is even AND divisible by 3
• the number ends in 0 or 5
• the last 2 digits are divisible by 4 or both zeroes
• the sum of a digits is divisble by 3

A number is divisible by 10 when…

• the number ends in 0
• the sum of the digits is divisible by 9
• the number is even AND divisible by 3
• the number ends in 0 or 5
• the last 2 digits are divisible by 4 or both zeroes

Select the prime numbers.

• 1
• 7
• 5
• 8
• 22

A prime numbers factors are 1 and…

• itself
• 2
• 5
• 7

In the phrase "2 raised to the 4th power" the 4 is the

• exponent
• base
• prime
• composite