 ### Teacher Guide to Addition and Subtraction

Counting

The easiest way to learn how to add and subtract is to count it out. Use your fingers and toes, a bowl of dry beans, toy blocks, or anything that you have around. To practice adding, count the number of blocks, for instance, of the first number and set those aside. Next, count out the second number and add those to your first pile. To get your sum, count all the blocks you have set aside.

Learning to subtract is just as easy. Begin by counting out the larger number of blocks. Next, take away the second number. Lastly, count the remaining blocks to get your answer.

Using a Reference Number

The hardest part about counting is knowing what to do if you do not have enough items to count. When this happens, you need to "lock" the biggest number in your head, then start counting on your fingers, or whatever else you have available, from there. For example, if you are adding 9 + 7, you would start by "locking" the number 9 in your head and then using your fingers to count out the rest.

You can also break your problem down into parts by drawing a ladder. For example, if you are subtracting 12 - 7, draw a ladder with 7 and 12 marked and then draw a step between them - say 10. You can then figure out the difference between steps, in this case
10 - 7 = 3 and
12 - 10 = 2.
Next, add 3 + 2 (it equals 5) - so, the answer to 12 - 7 is 5.

Play Games

For practice with addition and subtraction, try playing number-base games, such as Yahtzee or Uno. In each of these games you keep score by adding and subtracting. In addition to games you play with friends, you can always ask your teacher or parent to help you find these types of games online.

Tell a Story

Sometimes, addition and subtraction are easiest when you are able to tell a story with the numbers. For example, if your teacher assigns you a problem, like 3 + 2, you can find the answer by asking yourself a question like, "If I have three video games and I get two for my birthday, how many video games would I have?"