The Scaffolding Lab

All skills. Every level.

GRADE 2 · MATH · 2.NBT.B.5

Addition within 100

Add within 100 using place value, properties of operations, and the relationship between addition and subtraction.

This practice supports part of 2.NBT.B.5; it is not a complete assessment of the standard.

Make a free worksheet

See the generated worksheet

Actual output from this skill’s generator. The answer key comes from the same saved example.

Generated Addition within 100 student worksheet with four problems
Student page · Open to enlarge
Matching Addition within 100 answer key
Matching answer key · Open to enlarge

Try a short sample

Work out each answer and explain your method. These original examples illustrate the skill; the generator creates fresh practice.

  1. 27 + 35
  2. 46 + 18
  3. 39 + 24
Teacher answer key
  1. 62
  2. 64
  3. 63

Same goal, different support

With support

Show 27 and 35 with tens and ones. Combine the ones and trade ten ones for one ten.

Independent practice

Solve the sample, show your method, and check your answer using a second representation or operation.

Extend the reasoning

Create a new example for the same skill. Write a plausible incorrect answer and explain how a model or calculation disproves it.

A misconception to discuss

A carried ten represents ten ones, not one extra one. Ask students to show the trade with a drawing.

Connect the learning

Before this: Addition within 20

Next connection: Addition within 1,000