Subtraction Sentences Using Number Lines - Up to 20
⏪ Put it in reverse! When we subtract on a number line, our frog jumps backward. Let's read the backward hops!
Do this: Read the concept below, then try the quiz or activity.
Concept
A number line is great for subtraction because you can actually SEE the numbers getting smaller.
🎯 Reading Backward Hops: Imagine a frog hopping backwards (to the LEFT). 1. The Starting Point: Look for the dot at the highest number. Where did the frog start? It started on 15. 2. The Backward Hops: Count the curved jumps going backward. It hopped backward 4 spaces. 3. The Landing Spot: Where is the final dot? It landed on 11.
The Math Sentence: Start - Hops = Landing Spot 15 - 4 = 11.
Try it
Read the backward jumps!
Instructions: Imagine the frog jumping backward to write the math sentence.
Problem 1: A frog starts at 18. It hops 3 spaces backward. Where does it land? * Sentence: ___ - ___ = ___
Problem 2: A frog starts at 14. It hops backward and lands on 9. How many hops did it take? * Equation: 14 - ___ = 9 * Answer: ___ hops
Problem 3: You see a picture: The start dot is at 20. There are 5 backward jumps. What is the landing spot? * Sentence: 20 - 5 = ___ * Answer: ___