Skip Counting by 15's

The concept on skip counting by 15’s or fifteens is an essential skill to learn when making the jump from counting to basic addition.

The sequence chart will help us to write the number to complete the series which involves skip counting by fifteens up to tens times.

Skip Counting By 15

Skip counting by 15’s up to 10 times –

15,

1

time

30,

2

time

45,

3

time

60,

4

time

75,

5

time

90,

6

time

105,

7

time

120,

8

time

135,

9

time

150,

10

time

I. Now look at the chart above where every fifteenth number is in dark yellow color and fill in the blanks below:

(i) 15 × 12 = _____

(iv) 15 × 8 = _____

(vii) 15 × 9 = _____

(x) 15 × 0 = _____

(xiii) 15 × 1 = _____

(ii) 15 × 9 = _____

(v) 15 × 3 = _____

(viii) 15 × 11 = _____

(xi) 15 × 7 = _____

(xiv) 15 × 5 = _____

(iii) 15 × 10 = _____

(vi) 15 × 4 = _____

(ix) 15 × 6 = _____

(xii) 15 × 2 = _____

(xv) 15 × 7 = _____

II. Complete the skip counting series by 14s:

(i) 45, ____, ____, ____, 105, 120, ____, ____.

(ii) 30, ____, ____, 75, 90, ____, ____, ____.

(iii) 60, ____, ____, ____, ____, 135, 150.

(iv) ____, ____, ____, ____, 105, 120. 

(v) ____, ____, ____, 120, 135, 150, ____.

(vi) 75, ____, 105, ____, ____, 150, 165. 

(vii) 15, ____, ____, ____, 75, ____, ____, 120.

(viii) ____, ____, ____, ____, 90, 105, ____.

(ix) ____, ____, ____, ____, ____, 165, 180.

(x) 0, 15, ____, ____, 60, ____, ____, ____.


Answers:


I. (i) 180

(iv) 120

(vii) 135

(x) 0

(xiii) 15

(ii) 135

(v) 45

(viii) 165

(xi) 105

(xiv) 75

(iii) 150

(vi) 60

(ix) 90

(xii) 30

(xv) 105

II. (i) 45, 60, 75, 90, 105, 120, 135, 150.

(ii) 30, 45, 60, 75, 90, 105, 120, 135.

(iii) 60,  75, 90, 105, 120, 135, 150.

(iv) 45, 60, 75, 90, 105, 120. 

(v) 75, 90, 105, 120, 135, 150, 165.

(vi) 75, 90, 105, 120, 135, 150, 165.

(vii) 15, 30, 45, 60, 75, 90, 105, 120.

(viii) 30, 45, 60, 75, 90, 105, 120.

(ix) 90, 105, 120, 135, 150, 165, 180.

(x) 0, 15, 30, 45, 60, 75, 90, 105.







2nd Grade Math Practice

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