Subtraction – reverse addition!
A boy walking backwards Subtracting numbers is just the same as adding them, only walking the other way along the number line. To subtract 3 from 8, you start on the number [...]
29
07, 2017
29
07, 2017
Simple operations – fun with math
Walk along a chalk line The four basic things you do with numbers are addition, subtraction, multiplication, and division. Each of these is basically a way of describing how fast you are moving along [...]
29
07, 2017
Commutative project – Chalk number line
Walk along a chalk line To get to understand the number line better, mark out a line on the playground or on the sidewalk outside your house with chalk. At the middle of [...]
29
07, 2017
Commutative property of addition
A number line is infinite in both directions. When people say that addition is commutative, that means that it doesn't matter what order you add up the numbers. 3 + 6 [...]
29
07, 2017
Addition – How to add whole numbers
A number line is infinite in both directions. Adding numbers is like walking along a path, the number line. To add two small numbers, like 7 + 4, you can just [...]
