You can also use part-whole models to help with addition ... to split 14 into 1 ten and 4 ones. It's much easier to add 10 to 25, then add the 4. Let’s take a look at subtraction now.

Learn about number bonds to 100 using tens and ones ... subtracting a one-digit number from a three-digit number. How to add and subtract in your head Explore how to use mental methods for ...