Practice and check
Worked example
Add the same step at every position, including the blanks.
6 + 6 = 12; 12 + 6 = 18
- 6 + 6 = 12; 12 + 6 = 18
Check answers after trying
1: 6 2: 12 3: 18 4: 24 5: 30 6: 36 7: 42 8: 48 9: 54 10: 60
Printed order
Tips for Parents
▸ What to do Count by 6s to fill in the missing numbers. Add the same step at every position, including the blanks. First question, checked from the printed data: 6 + 6 = 12; 12 + 6 = 18. ▸ Start with an example Have your child count out loud from 6 to 60, and if they already know their 3s, encourage them to double each one as a shortcut — 3 doubled is 6, 6 doubled is 12 — rather than adding 6 from scratch every time. Doubling is usually faster and more reliable for young children than repeated addition, since it only requires holding one number in mind instead of tracking a running total. Let your child use fingers, blocks, or drawn pairs to double small numbers if the mental math alone feels shaky at first. ▸ If it is difficult If a blank like 18, 30, 36, 48, or 54 stumps them, point them to the nearest given number (6, 12, 24, 42, or 60) and have them count forward by 6 one step at a time, using fingers or tally marks to keep track. Encourage your child to say each number aloud as they add — "24... 30... 36" — rather than adding silently, since speaking the sequence helps catch mistakes before they get written down. If a blank sits roughly halfway between two given numbers, doubling from the nearer neighbor is often quicker than counting forward from either end. ▸ Check before continuing Skip Counting - Count by 6s — Check the completed work using this instruction: Add the same step at every position, including the blanks. Point to one correction and explain the step used. Revisit that part if the explanation and the marks do not agree.
What This Worksheet Builds
Counting by 6s (6, 12, 18, 24...) is the first genuinely challenging sequence in this series, since it doubles the 3s pattern but no longer offers an easy visual shortcut like even numbers or finger-counting. Success here depends less on memorizing a list and more on strategy — recognizing that each number is simply the previous multiple of 3 doubled, and using that relationship to check or generate answers quickly. Mastering this flexible, relational way of thinking about numbers is exactly what prepares children for multiplication tables and mental math down the road.
Next Step
If your child gets stuck, have them count by 3s first, saying every other number aloud to rebuild the 6s sequence from a pattern they already trust. Once this sheet feels comfortable, move on to Skip Counting by 7s — the hardest pattern of all, since it shares no easy relationship with an already-familiar sequence and offers no shortcut trick, so it truly tests whether the counting strategies practiced here have become second nature.