T4T Add Three 2-Digit Numbers (NBT.6)
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Adding Three 2-digit Numbers
Number and Operations in Base Ten
Adding and Subtracting within 1000
NC.2.NBT.6 Add up to three, two-digit numbers using strategies based on place value and properties of operations.
task sheet, pencil, base ten blocks, snap-cubes or Unifix cubes, hundred charts
Read the problem to the students:
How many cans did the second-grade class bring in?
Continuum of Understanding
Not Yet Proficient
Checklist for teacher to identify mastery of standard:
Standards for Mathematical Practice
1. Make sense and persevere in solving problems.
2. Reason abstractly and quantitatively.
3. Construct viable arguments and critique the reasoning of others.
4. Model with mathematics.
5. Use appropriate tools strategically.
6. Attend to precision.
7. Look for and make use of structure.
8. Look for and express regularity in repeated reasoning.
A second-grade class was collecting cans of food for the Thanksgiving Canned Food Drive. On Monday 38 cans were brought in. On Tuesday 54 cans were collected. On Wednesday they collected 72 cans. How many cans did the second-grade class bring in?
Solve the problem.
Use pictures, words, or number to represent your strategy.