Quick Subtraction - 2 Ways

Hello there! For today's video, I will talk about subtraction. It will be a shorter video today given the topic is on the simpler side. Today, I will talk about the 2 ways that we can do quick subtraction. The first way is to over subtract and add the extra that you subtracted. The second way is to under subtract and subtract the amount you missed.

For example:
89 - 11 = 78. You can subtract this normally and get 78. Using the first method, you can rewrite this problem as 89-19 which is 70 and then add back the 8 that you "subtracted too much of" which gives you 78. Using the second method, you can rewrite this problem as 89-10 which is 79 and then subtract the 1 that you "missed" which gives you 78. In simple subtraction, this won't seem significant as a time saver but for bigger numbers, you'll definitely shave off some time from using one of these methods.

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