Real-World Examples of Subtracting Decimals Using Models

📚 Quick Study Guide

🔢 Decimal Subtraction Basics: Align the decimal points, subtract as you would with whole numbers, and bring the decimal point straight down. 🧱 Using Models: Represent decimals using base-ten blocks or drawings. A large square represents 1, a rod represents 0.1, and a small square represents 0.01. visual Visual Representation: Cross out or remove blocks/parts to represent subtraction. This helps understand the concept visually. 💡 Real-World Applications: Think of scenarios like calculating change, measuring ingredients, or determining the difference in lengths.

🧮 Practice Quiz

1. What subtraction problem is modeled by starting with 3 whole squares and 4 rods, then removing 1 whole square and 2 rods?
   1. 2.2
   2. 4.6
   3. 1.2
   4. 3.6
2. A model starts with 2 whole squares, 3 rods, and 5 small squares. If 1 whole square, 1 rod, and 2 small squares are removed, what decimal is represented by the remaining model?
   1. 1.23
   2. 3.45
   3. 1.35
   4. 2.12
3. Sarah has 4.7 meters of fabric. She uses 2.3 meters to make a dress. Use a model to find how much fabric she has left.
   1. 6.0 meters
   2. 2.4 meters
   3. 6.7 meters
   4. 3.4 meters
4. John has $5.50. He spends $3.20 on a snack. Use a model to determine how much money he has left.
   1. $8.70
   2. $2.30
   3. $8.30
   4. $1.30
5. A scientist has 2.8 liters of a solution. She uses 1.5 liters for an experiment. Use a model to find out how much solution is remaining.
   1. 1.3 liters
   2. 4.3 liters
   3. 3.3 liters
   4. 0.3 liters
6. Emily walks 1.9 miles to school and David walks 0.6 miles. Use a model to find the difference in the distances they walk.
   1. 2.5 miles
   2. 1.3 miles
   3. 0.3 miles
   4. 3.5 miles
7. A recipe calls for 3.6 cups of flour. You only want to make a smaller batch and decide to use 1.1 cups less. Use a model to find how much flour you will use.
   1. 4.7 cups
   2. 2.5 cups
   3. 3.7 cups
   4. 1.5 cups