The concept on skip counting by 13’s or thirteens 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 thirteens up to tens times.
Skip counting by 13’s up to 10 times –
13, 1 time 
26, 2 time 
39, 3 time 
52, 4 time 
65, 5 time 
78, 6 time 
91, 7 time 
104, 8 time 
117, 9 time 
130, 10 time 
I. Now look at the chart above where every thirteenth number is in dark yellow color and fill in the blanks below:
(i) 13 × 4 = _____ (iv) 13 × 1 = _____
(vii) 13 × 6 = _____ (x) 13 × 3 = _____ (xiii) 13 × 7 = _____ 
(ii) 13 × 0 = _____ (v) 13 × 10 = _____
(viii) 13 × 5 = _____ (xi) 13 × 9 = _____ (xiv) 13 × 11 = _____ 
(iii) 13 × 8 = _____ (vi) 13 × 12 = _____
(ix) 13 × 2 = _____ (xii) 13 × 9 = _____ (xv) 13 × 6 = _____ 
II. Complete the skip counting series by 13s:
(i) 26, ____, ____, ____, 78, ____, ____, 117.
(ii) 0, ____, ____, 39, 52, ____, ____, ____.
(iii) 52, ____, ____, ____, ____, 117, 130.
(iv) ____, ____, ____, ____, 91, 104.
(v) ____, ____, ____, 91, 104, ____, ____.
(vi) 78, ____, 104, ____, ____, 143, 156.
(vii) 13, ____, ____, ____, 65, ____, ____, 104.
(viii) ____, 26, ____, ____, ____, 78, 91, ____.
(ix) ____, ____, ____, ____, ____, 143, 156.
(x) ____, ____, ____, ____, 104, 117, ____, ____.
Answers:
I. (i) 52 (iv) 13
(vii) 78 (x) 39 (xiii) 91 
(ii) 0 (v) 130
(viii) 65 (xi) 117 (xiv) 143 
(iii) 104 (vi) 156 (ix) 26
(xii) 117 (xv) 78 
II. (i) 26, 39, 52, 65, 78, 91, 104, 117.
(ii) 0, 13, 26, 39, 52, 65, 78, 91.
(iii) 52, 65, 78, 91, 14, 117, 130.
(iv) 39, 52, 65, 78, 91, 104.
(v) 52, 65, 78, 91, 104, 117, 130.
(vi) 78, 91, 104, 117, 130, 143, 156.
(vii) 13, 26, 39, 52, 65, 78, 91, 104.
(viii) 13, 26, 39, 52, 65, 78, 91, 104.
(ix) 78, 91, 104, 117, 130, 143, 156.
(x) 52, 65, 78, 91, 104, 117, 130, 143.
`2nd Grade Math Practice
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