answersLogoWhite

0

If it is a multiple of 4.

To check if a number is divisible by 4, first it must be even (end in one of the digits 0, 2, 4, 6, 8). Then add twice the tens digit to the ones digit; if this sum is divisible by 4 then so is the original number.

As the test can be applied to the sum, repeat the summing until a single digit remains; if this digit is 4 or 8 then the original number is divisible by 4.

eg 123456789 is not divisible by 4 as it is odd (ends in one of the digits 1, 3, 5, 7, 9).

eg 123456798: 2x9 + 8 = 26; 2x2 + 6 = 10; 2x1 + 0 = 2 which is not 4 nor 8, so 123456798 is not divisible by 4.

eg 123987564: 2x6 + 4 = 16; 2x1 + 6 = 8 which is 4 or 8, so 123876564 is divisible by 4.

User Avatar

Wiki User

10y ago

Still curious? Ask our experts.

Chat with our AI personalities

CoachCoach
Success isn't just about winning—it's about vision, patience, and playing the long game.
Chat with Coach
BeauBeau
You're doing better than you think!
Chat with Beau
ViviVivi
Your ride-or-die bestie who's seen you through every high and low.
Chat with Vivi

Add your answer:

Earn +20 pts
Q: How is a number divisible by 4?
Write your answer...
Submit
Still have questions?
magnify glass
imp