Add Whole Tens Worksheets for 1st Grade
Add two multiples of ten together (e.g. 30 + 40). 15 free printable worksheets, each with an answer key.
Save to PinterestFree Add Whole Tens Worksheets
Click a worksheet to open the PDF, or grab the matching answer key. Every sheet prints on one page.
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Add Whole Tens: what children learn
Adding whole tens applies a single-digit addition fact at a bigger scale — "3 + 4 = 7" becomes "30 + 40 = 70" with a zero tacked onto each number.
Add Whole Tens: worked example
30 + 40 = 70
Think of it as 3 tens plus 4 tens: 3 + 4 = 7, so the answer is 7 tens, or 70.
Add Whole Tens: a common mistake to watch for
Kids sometimes forget the trailing zero and write "7" instead of "70" — connecting it back to the single-digit fact helps this stick.
Add Whole Tens: how to help at home or in class
Use dimes if you have them, or craft sticks bundled in tens. Count out one handful of bundles and then another, and have your child name the bundle total first. Then say it as tens: four tens and two tens make six tens, which is sixty. Practice with a hundred chart by jumping down a column. When your child can add the bundles and say the new number with the zero right away, move on to adding bundles plus singles.
What is on these Add Whole Tens worksheets
This set has 15 different worksheets for 1st grade, with 17 questions on each and a matching answer key for every sheet. The instruction printed on each worksheet is: “Add the numbers and write the sum.”
Example questions like the ones on these worksheets, with their answers:
- 20 + 60 = 8080
- 50 + 40 = 9090
- 20 + 10 = 3030
- 80 + 10 = 9090
- 50 + 30 = 8080
- 50 + 20 = 7070
- 10 + 70 = 8080
- 70 + 20 = 9090
Every answer on every sheet is checked by a separate program before the worksheet is published. How we check answers