Skip Counting Nines
Skip counting nines may seem difficult at first. As the numbers we use get larger, it is easy to get overwhelmed, but honestly, once you get past eight, nine through twelve are easier. There is a little trick your child can use to remember the multiples of nine.
The trick is that whatever the answer is, it will always add up to nine. For example:
9 X 2 = 18
If you add the two digits in the answer together:
1 + 8 = 9
From 18, your child can then work his way through factor families by increasing the first digit (in this case "1") and decreasing the second digit (in this case "8"):
1 + 8 = 9
2 + 7 = 9
3 + 6 = 9
4 + 5 = 9
5 + 4 = 9
6 + 3 = 9
7 + 2 = 9
8 + 1 = 9
9 + 0 = 9
An easier way is to drop a digit from whatever factor nine is paired with and then add it up to nine. For example:
9 X 7 = ?
In the example above, nine is paired with a factor of seven. Drop a digit, you now have the number 6. Six plus 3 equals nine so the answer is 63. Let's try another one.
9 X 5 = ?
In this example, nine is paired with five. Drop down to 4. Four plus 5 equals nine. The answer is 45. It may seem tricky at first, but once your child gets this quick method down, he or she will be the fastest kid in class!
The same trick holds true for larger multiples, you just may have to do more adding, it's not entirely useful for larger numbers, but it is a good way to check your work. Example:
9 X 26 = 234
2 + 3 + 4 = 9
Skip Counting Worksheets
Click the pictures below to download and print out these free math worksheets that cover counting by nines.
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