Making learning the 9 times table a breeze
As your child progresses up the number chart, learning the times table can get difficult. The bigger the number, the more difficult it gets to add, so the child might get intimidated. The 9 times table can be tough, but there are a few ways to make it easier to learn.
The 9 times table has some hidden patterns in it. If you learn to exploit them, learning how to multiply will be a breeze.
The hidden patterns in the 9 times table
The digits add up to 9
One way to check whether a number is in the 9 times multiplication table is to check whether it adds up to 9. The digits of multiples of 9 up to 90 always add up to 9.
For example: 9 X 2 = 18. If you add 1 and 8, you get 9. 1 + 8 = 9.
Lets try another example: 9 X 5 = 45. If you add 4 and 5, you get 9. 4+5 = 9.
Spotting the underlying pattern
Let’s have a look at the 9 times table chart:
Look at the digits in the tens column and the ones column. Do you see the pattern? Every time you go down the next line, the number decreases by 1 in the ones column. And in the tens column, the number increases by 1.
So, it’s easier to learn if you remember that the number in the tens column is always 1 less than the number you’re multiplying 9 by. For example: 9 X 2 = 18. Here, according to the place value system, the number 1 is in the tens column and 8 is in the ones column. 1 is less than 2, which is the number you’re multiplying 9 by.
Another thing you can see here is the sequence of the numbers. Check out the table below. You’ll see that as you go down the nine times table, the numbers in the tens column are in the sequence 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. And in the ones column, the numbers are in a backward sequence, 9, 8, 7, 6, 5, 4, 3, 2, 1 and 0.
9 times table finger trick
Here’s a useful trick to master the 9 times multiplication table quickly. Put both your palms on the table with your fingers spread out. Number each of your fingers from 1 to 10. Now let’s find out how much 9 X 7 is using your fingers.
Fold your finger that’s marked 7. The fingers to the right of the folded finger are ones and the fingers to the left are the tens. Now count the number of fingers to the left of the 7th finger. And then count the number of fingers that is to the right of the folded finger. You have 6 fingers open to the left and 3 fingers open to the right. So the answer for 9 X 7 is 63. Here is a picture to help you understand better.
Step 1: Number your fingers.
Step 2: Fold the 7th finger. Now the fingers that are open on the left are your tens and the fingers on the right are your ones. Count the number of fingers to the left of the folded finger. Then count the number of fingers to the right of the folded finger.
Step 3: You have 6 fingers to the left of the folded finger and 3 fingers to the right. So the answer to 9 X 7 is 63.
The 9 times table finger trick is an easy way to help your child learn the 9 times multiplication table.
Subtracting From 10
Another trick to learn the 9 times multiplication table is the subtracting from 10 trick. When you subtract 9 from 10 you’re left with 1. 9 -10 = 1. To find out what 9 times any number is subtract that number from 10 times that number. For example, let’s find out what 9 times 5 ( 9 X 5) is.
9 X 5 = (10 X 5) – 5 = 50 – 5 = 45
So, 9 X 5 = 45.
Here is another example to help you understand:
9 X 8
10 X 8 = 80
80 – 8 = 72
So, 9 X 8 = 72.
This might seem complicated at first, but it’s fairly easy especially if your child has already learnt 10 times tables. Also, this method will help sharpen your child’s subtraction skills along with their multiplication skills.
Get them to work it out
The 9 times table might prove to be a bit hard to learn for some kids. It’s because the larger the number, the larger the answer when it’s multiplied. Moreover, the repeated addition method becomes too difficult when there are bigger numbers involved. So, it’ll take a bit of patience and dedication to help your child learn the 9 times table. A firm understanding of the place value system will be really helpful for the child to learn the tables easily.
Regular recitation of the tables loudly will help them remember the times tables easily. Get your child to work out practice worksheets and write the tables regularly. You can also check out these cool multiplication games for kids at Osmo, which make learning times tables fun. With these tips and tricks and regular practice, your child will be multiplying by 9 in no time at all.