Many times, mental math is a better way to solve math problems than using an algorithm. Here are two approaches to division using mental math.
Example 1: 75 ÷ 6
6 is the same as 2 x 3, so instead of dividing by 6, we can divide 75 by 3 and then divide that quotient by 2. So, 75 ÷ 3 = 25, and 25 ÷ 2 = 12 1/2. Done!!!
Try these:
1) 99 ÷ 6 = ____________
2) 75 ÷ 15 = _____________
3) 150 ÷ 12 = ______________
4) 430 — 20 = _______________
Example 2: 200 ÷ 25
Another way to look at division is to ask yourself, “How many of these are inside of that?” For 200 ÷ 25, ask yourself how many 25s are there inside 100. There are 4 25s in 100, so inside of 200 there must be twice as many; 8. So, 200 ÷ 25 = 8.
Try these:
1) 300 ÷ 25 = _____________
2) 90 ÷ 15 = _____________
3) 1,000 ÷ 125 = ______________
4) 6 — 1 1/2 = ______________
Answer a few questions to see how it works
My Child is:
Mathnasium meets your child where they are and helps them with the customized program they need, for any level of mathematics.
We have nearly 1,000 neighborhood centers nationwide. Get started now.
