Add within 100 and 10 More, 10 Less
Two-digit addition that makes sense: add tens to tens and ones to ones with base-ten blocks, make a new ten, find 10 more and 10 less on hundreds chart pieces, subtract tens and solve word problems within 100.
A free printable with 3 of the 10 worksheets, in color and black & white, with the answer key.
- 9 worksheets + an adding-within-100 reference page
- 10 more, 10 less and subtracting tens
- Answer key for every page
- Grade
- Grade 1
- Full set
- 10 worksheets in color, the same 10 in black & white, answer key · 26 pages
- Format
- PDF, US Letter (8.5 × 11 in)
- Standards
1.NBT.C.4Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10.
1.NBT.C.5Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count.
1.NBT.C.6Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
The full set is on its way. Try the free sample with your class now. Leave your email when you download and we'll tell you when new worksheets are ready.
What's inside
- Adding within 100
- 10 More and 10 Less
- Hundreds Chart Pieces
- Add Tens
- Add Ones
- Add Ones: Make a New Ten
- Subtract Tens
- Mixed Practice within 100
- Word Problems within 100
- Assessment
Every worksheet comes in color and in black & white, with an answer key at the end.
How to use these math worksheets
Use the reference page to teach or review, then pick the worksheets that fit your lesson. They work for small groups, morning work, centers and homework. The last page is a short assessment.
Skills practiced
More practice: first grade place value & hundreds chart worksheets · all first grade math worksheets
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