Missing Numbers on a Number Line to 100
Eight number lines with numbers between 21 and 99 and four blanks on each: six lines count forward and the last two count backward, which is where children usually slip (from 61 back to 59, for example). Good practice for crossing a ten in first and second grade, with an answer key on page 2.
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- Size
- US Letter (8.5 × 11 in), fits A4
- 2 pages: the worksheet and its answer key
- Level
- Grade 1
- License
- Free for personal & classroom use
About this worksheet
Eight number lines with numbers between 21 and 99 and four blanks on each: six lines count forward and the last two count backward, which is where children usually slip (from 61 back to 59, for example). Good practice for crossing a ten in first and second grade, with an answer key on page 2. It matches first grade goals, roughly ages 6 to 7.
Tips for using it
- 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.
- Keep a 0 to 20 strip on the desk during any addition or subtraction worksheet.
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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