Counting by 3s Worksheets for 3rd Grade
Fill in the missing number when counting up by 3s. 15 free printable worksheets, each with an answer key.
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Click a worksheet to open the PDF, or grab the matching answer key. Every sheet prints on one page.
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Worksheet #14
Worksheet #15
Counting by 3s: what children learn
Counting by 3s builds the base for the 3 times table. The lists here sometimes start on a number that is not a multiple of 3, so children must use the jump of 3 and not memory.
Counting by 3s: worked example
14, 17, __, 23, 26 20
Each number is 3 more than the one before it. 17 + 3 = 20, and 20 + 3 = 23.
Counting by 3s: a common mistake to watch for
Kids sometimes count by 2s or 4s by mistake, so checking the jump between two known numbers helps.
Counting by 3s: how to help at home or in class
Count with a rhythm: stomp on every number you say and whisper the beat between. Begin from 14 or another number that is not a multiple of 3, so your child has to keep the jump and cannot lean on memory. Write down the counted numbers as a list afterwards and check that every neighbouring pair is 3 apart. When starting anywhere works smoothly, counting by 4s is next.
What is on these Counting by 3s worksheets
This set has 15 different worksheets for 3rd grade, with 16 questions on each and a matching answer key for every sheet. The instruction printed on each worksheet is: “Find the pattern and write the missing number.”
Example questions like the ones on these worksheets, with their answers:
- 766, 769, 772, __, 778775
- 721, 724, 727, __, 733730
- 906, __, 912, 915, 918909
- 244, 247, __, 253, 256250
- 690, 693, 696, __, 702699
- 942, __, 948, 951, 954945
- 20, 23, 26, __, 3229
- 765, 768, __, 774, 777771
Every answer on every sheet is checked by a separate program before the worksheet is published. How we check answers