Divisibility Rules and Simplifying Fractions

The video tutorial covers divisibility rules for numbers 2, 3, 5, and 10, explaining how to determine if a number is divisible by these numbers. It also introduces the cake method for simplifying fractions, demonstrating step-by-step how to reduce fractions to their simplest form using common divisors.

Which of the following numbers is divisible by 2?

• 103

• 1117

• 108

• 77

Tags

CCSS.3.OA.D.9

What is the rule to check if a number is divisible by 3?

• The number must end in 0 or 5.

• The number must end in 0.

• The sum of the digits must be divisible by 3.

• The number must end in 0, 2, 4, 6, or 8.

Tags

CCSS.4.OA.B.4

Is the number 237 divisible by 3?

• Yes, because the sum of its digits is divisible by 3.

• Yes, because it ends in 3.

• No, because the sum of its digits is not divisible by 3.

• No, because it ends in 7.

Tags

CCSS.4.OA.B.4

Which of the following numbers is divisible by 5?

• 1110

• 72

• 237

• 108

Tags

CCSS.3.OA.D.9

What is the rule to check if a number is divisible by 10?

• The sum of the digits must be divisible by 10.

• The number must end in 5.

• The number must be even.

• The number must end in 0.

What is the first step in the cake method for simplifying fractions?

• Divide the numerator by the denominator.

• Add the digits of the numbers.

• Set up an upside-down division sign and place the numbers inside.

• Check if the numbers are prime.

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

If both numbers in a fraction are even, which number should you divide by first in the cake method?

• 3

• 10

• 5

• 2

What is the simplified form of the fraction 24/40?

• 12/20

• 6/10

• 8/10

• 3/5

What is the simplified form of the fraction 45/50?

• 9/10

• 7/8

• 3/5

• 5/6

Tags

CCSS.6.EE.A.1

What is the trick to simplify fractions that have zeros at the end?

• Divide by 5.

• Divide by 10.

• Remove the zeros at the end.

• Add the digits.

Tags

CCSS.6.EE.A.1