Grade 2 - Math

Grade 2 Addition Within 100 Worksheet

6 printable versions - Building Confidence - About 7 minutes each

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Addition Within 100

Grade 2 - Math - Building Confidence

Worksheet 1

  1. Add within 100: 29 + 5 = ____

  2. Start at 12 and add 36. What is the sum?

    A math model showing the known values from the question and leaving the requested value to solve.A number line labelled from 12 to 48, marked every 4.12162024283236404448

  3. A class has 7 blue cubes and 31 red cubes. How many cubes are there in all?

    A math model showing the known values from the question and leaving the requested value to solve.A bar model. The top bar is the whole and the bars below it are the 2 parts. Empty boxes mark the values to be found.731

  4. Which equation shows 18 plus 24?

  5. When adding 7 + 29, what is the ones-column sum before regrouping?

  6. Add within 100: 21 + 9 = ____

  7. Start at 11 and add 25. What is the sum?

    A math model showing the known values from the question and leaving the requested value to solve.A number line labelled from 11 to 36, marked every 3.111417202326293235

  8. A class has 17 blue cubes and 21 red cubes. How many cubes are there in all?

    A math model showing the known values from the question and leaving the requested value to solve.A bar model. The top bar is the whole and the bars below it are the 2 parts. Empty boxes mark the values to be found.1721

  9. Which equation shows 17 plus 7?

  10. When adding 25 + 14, what is the ones-column sum before regrouping?

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About this worksheet

Adding within one hundred is where second graders begin to coordinate facts, tens, and place value. They may know that seven plus five is twelve but still struggle when the same fact appears in the ones column of thirty-seven plus five. This worksheet keeps every sum within one hundred while varying the representation. Some questions are plain equations, some are short word problems, and some show the relationship on a number line or part-whole model. The variety matters because a child who can solve only one format may not yet understand the operation. Watch especially for regrouping errors, such as writing the ones-column sum as a two-digit number without carrying the ten. Ask your child to explain where each ten went.

What your child will learn

  • Add two numbers with sums up to 100
  • Use number lines and part-whole models for addition
  • Connect word problems to addition equations
  • Check regrouping in the ones column

Worked example

For 38 + 27, add the ones first: 8 + 7 = 15. Write 5 ones and carry 1 ten. Then 3 tens + 2 tens + 1 ten = 6 tens, so the sum is 65.

Common mistake

Adding the ones column correctly but forgetting to add the carried ten to the tens column.

Helpful hint

Keep the total under 100 and check whether the ones make a new ten.

Number PatternsTwo-Digit Addition

Questions parents ask

What is the most common mistake with addition within 100?
Adding the ones column correctly but forgetting to add the carried ten to the tens column.
How can I help my child with addition within 100?
Keep the total under 100 and check whether the ones make a new ten.
Are these 2nd grade math worksheets free to print?
Yes. All 6 printable versions on this page are free to download and print, with no account needed.

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