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Ok, so where are we at? At this point we've learned there are tricks to easily get us through multiples from 1 through 5. Well at this point there's some bad news and some good news. The bad news is there isn't a lot of tricks for the multiplies of 6, 7, and 8. The good news is we don't need tricks for half of the multiples of 6, 7, and 8. Why? Well we've already learned them. We know what 6 x 4 is. We know what 7 time 3 is. We know what 8 x 5 is. We even know what 7 x 8 is and because of the commutative property we know what 8 x 7 is. Similarly we now what 6 x 6 and 8 x 8 thanks to some simply rhymes. Fortunately there's a bit more good news. There are some handy tricks for remembering the multiples of nine and since there are multiples of 6, 7, and 8 in the multiples of 9, we're going to whittle down the remaining math facts we need to tackle in the multiples of 6, 7, and 8. Let's look at math facts for the multiples of 9 now. Nine Is Just Fine The really nice thing about the math facts for 9 is that there isn't just one trick for remembering the multiples of nine...here's actually two. One method is pretty easy and the other method is a tiny bit more complicated. Let's start with the easy method.
4 x 3 Well, 2 x 3 = 6, and if we double six, we get 12. 4 x 3 = 12. Easy! Five Times Five Makes Me Feel Alive Now, on to the fives. Much like the twos, if you can count by fives (and most of us can), you can learn your five multiplication tables very easily. What is 3 x 5? Well, if you count up by fives, when you get to the third number (5, 10, 15), you get your answer: 3 x 5 = 15. And so it goes. Now if you’d like to learn a slightly more complicated, but still interesting way of learning the fives, try this. For any even numbers you are multiplying times five, take half of the number and put a zero after it. Huh? Well, here take a look: For example, 5 x 6 (6 is an even number) Take half of 6, which is 3. Add a zero and you get 30. 6 x 5 = 30.
Another example is 5 x 8. Now, for odd numbers multiplied by five, first subtract 1 from the number, and then halve it and add a 5 to the end. Here’s an example:
5 x 7
5 x 9 |
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