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Divisibility by 4 and 8

Divisibility by 4 and 8. The divisibility rules for 4 and 8 are as follows: 4- a number is divisible by 4 if the last two digits are divisible by 4 8- a number is divisible by 8 if the last three digits are divisible by 8

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Divisibility by 4 and 8

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  1. Divisibility by 4 and 8

  2. The divisibility rules for 4 and 8 are as follows: • 4- a number is divisible by 4 if the last two digits are divisible by 4 • 8- a number is divisible by 8 if the last three digits are divisible by 8 • Ex. Determine whether the number 823 136 947 452 is divisible by 4 and 8. • Solution: • The last 2 digits are 52 • 52/4=13 • The last 3 digits are 452 • 452/8 • 56.5 • The number 823 136 947 452 is divisible by 4 but not 8

  3. Example #1 • Determine whether the number 839 283 017 402 846 256 is divisible by 4 or 8 • Solution: • The last 2 digits are 56 • 56/4= 14 • The last 3 digits are 256/8= 32 • Therefore, 4 and 8 are factors

  4. Your turn • Explain whether 72 is divisible by 4 • 72/4=18 • Yes

  5. Practice • Page 18 #1 • Stop and Check • Continue onto #3, 4, 5, 8, 9

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