🎯 I Can Statement

I can use models and strategies to add and subtract decimals.

📊 Part 1: Using Decimal Models

1. Look at this decimal grid model showing 0.34 + 0.21. Which answer is correct?

(Imagine a 10x10 grid with 34 squares shaded for 0.34 and 21 more squares shaded for 0.21)

0.55

0.45

0.65

0.35

2. Using base-ten blocks, if you have 2 ones, 4 tenths, and 6 hundredths, then subtract 1 one, 2 tenths, and 3 hundredths, what decimal do you have left?

1.23

1.33

2.13

1.13

3. Emma used a number line to add 2.7 + 1.4. She started at 2.7 and made jumps. Which strategy would work best?

Jump forward 1, then forward 0.4

Jump forward 14 spaces

Jump backward 1.4

Jump to 4.1 directly

4. Which decimal models could you use to solve 1.25 - 0.38? Check all that apply.

Base-ten blocks

Decimal grids (hundredths)

Number line

Money (dollars and cents)

✏️ Part 2: Show Your Strategy

5. Solve 3.45 + 2.28 using any model or strategy. Draw or explain your method below:

Answer: _________

6. Marcus has $5.75. He buys a snack for $2.40. Use a strategy to find how much money he has left. Show your work:

Marcus has $_______ left.

7. Draw a number line to show 4.6 - 1.9. Mark your starting point, jumps, and ending point:

Answer: _________

🌟 Extension Challenge

8. Advanced Problem: A recipe calls for 2.75 cups of flour. Sarah only has 1.8 cups. How much more flour does she need? Use two different strategies to solve this problem:

Strategy 1:

Strategy 2:

Sarah needs _______ more cups of flour.

9. Explain which decimal model or strategy you find most helpful for adding and subtracting decimals and why: