# 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’s up to 10 times –

 15, 1time 30, 2time 45, 3time 60, 4time 75, 5time 90, 6time 105, 7time 120, 8time 135, 9time 150, 10time

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, ____, ____, ____.

 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.

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Skip Counting by 15's