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Grade 3 Math · World 2: Add-and-Subtract Express · Level 20
Story Problems
Solve one- and two-step problems within 10,000, and explain why the answer makes sense.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 20
- In a story problem, picture what's happening before you pick a way to solve it. A bar model can help.
- A farm stand sold 2,450 peaches in June and 1,875 in July. How many more were sold in June? The bars compare the two months.
- 2,450 minus 1,875 is 575. Check: 1,875 plus 575 is 2,450. It works!
- Watch out: the word more doesn't always mean add! Here, more asked how far apart two numbers are, so we subtracted.
Georgia's K-12 Mathematics Standards:
- 3.PAR.2.2 — Apply part-whole strategies, properties of operations and place value understanding, to solve problems involving addition and subtraction within 10,000. Represent these problems using equations with a letter standing for the unknown quantity. Justify solutions.