Add Two-Digit Numbers on an Open Number Line
Six two-digit addition problems (sums up to 99) with an open number line under each one, already marked with the starting number. Second graders jump by tens and then add the ones in one jump, writing each landing number. The answer key draws the jumps (+10, +10, +5) in red with every stop labeled, the strategy most US math programs teach before the column method.
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- Size
- US Letter (8.5 × 11 in), fits A4
- 2 pages: the worksheet and its answer key
- Level
- Grade 2
- License
- Free for personal & classroom use
About this worksheet
Six two-digit addition problems (sums up to 99) with an open number line under each one, already marked with the starting number. Second graders jump by tens and then add the ones in one jump, writing each landing number. The answer key draws the jumps (+10, +10, +5) in red with every stop labeled, the strategy most US math programs teach before the column method. Second graders usually finish it in 10 to 15 minutes. Have your child say each fact out loud while writing the answer.
On this sheet
6 problems, starting with 18 + 35, 20 + 27, 66 + 16, 52 + 35, 44 + 27, 39 + 22. The answers to all of them are on page 2.
Tips for using it
- Use small objects like buttons or cereal to check tricky problems.
- Let children hop with a finger or a small toy on the line before they draw hops with a pencil.
- Always mark the start number with a dot first; most mistakes come from counting the start as a hop.
- Say "forward" for adding and "back" for subtracting while hopping, so the direction sticks.
Printing tips
Download the PDF and print at 100% (or “fit to page” on A4). Page 1 is the worksheet and page 2 is the answer key with the answers in red; print just page 1 if you want to keep the answers for checking. Free for personal, family and classroom use.
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