Skip counting by 9s
Skip counting by 9s is called skip counting. Here the each number is 9 more than the previous number. In counting by 9's sometimes we get all odd numbers and sometime all even numbers, it depends on the first number. If the first number is odd or even then counting by 9's alternately we will get odd and even.
Example : Skip counting by 9's
1: 1 + 9 = 10; 10 + 9 = 19 ; 19 + 9=28 ; 28 +9= 37 ; 37 + 9 =46 and so on.
So if the 1st number is 1 then after skip counting by 9s we will get 1, 10, 19, 28, 37, 46,...
To find the next number by counting by 9's , add 9 to the given number.
Example 1 : Find the next number of 15 after counting it by 9's.
Solution : Add 9 to 15.
15 + 9 = 24.
So next number will be 24.
Example 2 : Find the next number of 81 after counting it by 9's.
Solution : Add 9 to 81.
81 + 9 = 90.
So next number will be 90.
Example 3 : Find the missing numbers using skip counting by 9's. 34,___,____,____,____,79.
Solution : As we have to find the missing number by 9's so add 9 to each number.
1st missing number = 34 +9 = 43
2nd missing number = 43 + 9 = 52
3rd missing number = 52+ 9= 61
4th missing number = 61 + 9 = 70
So the numbers are 34, 43,52,61,70, 79.
Skip counting by 9s up to 10 times .
|
9 1 time |
18 2 times |
27 3 times |
36 4 times |
45 5 times |
|
54 6 times |
63 7 times |
72 8 times |
81 9 times |
90 10 times |
Practice on skip counting by 9s
1) 9 x 3 = --------- 2) 9 x 8 = --------- 3) 9 x 6 = ---------4) 9 x 9 = --------- 5) 9 x 11 = --------- 6) 9 x 1 = ---------
7) 9 x 5 = --------- 8) 9 x 2 = --------- 9) 9 x 10 = ---------
10) 9 x 4 = --------- 11) 9 x 7 = ---------
II Complete the following counting by 9's:
1) 1,10,19,28,___, ____,_____,_____,_____.
2) 32,41,50,59,___, ____,_____,_____,_____.
3) 70,79,88,87,___, ____,_____,_____,_____.
4) 65,74,81,90,___, ____,_____,_____,_____.
Answers
I1) 27 2) 72 3) 54 4) 81
5) 99 6) 9 7) 45 8) 18
9) 90 10)36 11)63
II
1)37,46,55,64,73.
2) 68,77,86,95,104.
3) 96,105,114,123,132.
4) 99,108,117,126,135.
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