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’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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