MATH END OF YEAR PROJECT

Davisibility BY 4

• How to divide by 4?
• Multiply the tens digit by 2
• Add this product to the ones digit.
• If the sum is divisible by 4, then so is the number

EXAMPLE OF DIVIDING BY 4

• 46 / 4
• 4 X 2 = 8
• 8 + 6 = 14
• 14 / 4 = 3.5
• The number is not divisible because it ends in a point number.

Davisibility BY 8

• Multiply the hundreds digit by 4
• Multiply the tens digit by 2
• Add these products to the ones digit
• If the sum is divisible by 8, then so is the number

EXAMPLE OF Davisibility BY 8

• 362 / 8
• 3 X 4 =12
• 6 X 2 = 12
• 12 + 12 + 2 = 26
• 26 / 8 = 3.25
• It is not divisible because it end in a point number.

VOCABULARY

• Davisibility rule: a way to determine if one whole number is a factor of another whole number without actually dividing the entire number.