I'm trying to help my daughter learn maths. She is struggling with factors, which is to work out what numbers go into a larger number (division).
I've already learned that by summing numbers, if they make 3, it can divide by 3. I also know the rules for 2, 5, 6, 9 and 10.
I'm trying to see if there is a rule for 4. I'm thinking not.
https://www.quora.com/Why-does-the-divisibility-rule-for-the-number-4-work shows the following
The divisibility rule for 4 is in any large number, if the digits in tens and units places is divisible by then the whole number is divisible by 4.
This doesn't make sense. 56 divides by 4. However, the 2 numbers add to 11, and so can't be divided by 4.
It may very well get a "no" answer, but is there any pattern/method I can use for determining if a number can be divided by 4 if it is less than 100 (and greater than 4)