Add and Subtract 10 and 100 Worksheet
This Add and Subtract 10 and 100 Worksheet gives 2nd Grade students mental math practice with tens and hundreds, number patterns, and two word problems. An answer key is included, so checking work takes seconds.
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About this resource
Description
Adding and subtracting 10 and 100 is one of the biggest mental math jumps a second grader makes. Once a child sees that adding ten changes only the tens digit, and adding one hundred changes only the hundreds digit, three-digit numbers stop feeling scary. This add and subtract 10 and 100 worksheet gives students focused practice with that exact pattern, using numbers between 100 and 900 so place-value thinking stays front and center.
The worksheet is a printable, two-page PDF built for 2nd Grade. Part A gives six quick problems, evenly split between tens and hundreds, with a box beside each equation for the new number. Part B shows three number patterns and asks students to count on or back and fill in the two missing numbers, which links the skill directly to skip counting. Part C closes with two word problems set in a coin jar and a class food drive, so students practice choosing the operation before they compute. Use it as morning work, as a station rotation, as homework, or as a quick check before a place-value unit test.
What’s Included
- One printable worksheet page and one full answer key page (2-page PDF)
- Six mental math problems adding and subtracting 10 and 100
- Three number patterns to complete by counting on and counting back
- Two real-world word problems with room to write the answer
- Original illustration and a clean, roomy 2nd Grade layout
Three Reasons This Helps Kids
First, it builds real mental math fluency. Because the problems are solved in the head rather than with a written algorithm, students start noticing the place-value structure of numbers instead of counting one at a time. Second, it connects three related skills. Addition, subtraction, and skip counting all appear on the same page, so children see that counting by tens and adding ten are the same idea. Third, it transfers to the real world. The word problems ask students to decide whether to add or subtract before they solve, which is the step most children need the most practice with on this add and subtract 10 and 100 worksheet.
Ideas for Teachers and Parents
Read the first pattern in Part B out loud together and let the class chant the count before anyone writes. Pair students and have them explain which digit changed and why. Hand a small group a hundreds chart so they can trace the jump down one row for ten and down ten rows for one hundred. At home, turn Part C into a real activity by counting a jar of coins or a shelf of canned food together. This 2nd grade mental math worksheet also works well as a warm-up you can repeat with new numbers written on the board.
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