Subtract by Counting On - Up to 10
🤔 Here's a different way to subtract! Instead of counting back, we can count UP from the smaller number to the bigger number. This is a great strategy when numbers are close together!
Do this: Read the concept below, then try the quiz or activity.
Concept
"Subtract by Counting On" is like finding the distance between two numbers on a number line.It turns a subtraction problem into an addition puzzle!
🎯 When to Use This Strategy: This works best when the numbers are very close, like 9 - 7 .Counting back 7 steps is a lot of work.Counting ON from 7 to 9 is super fast!
Example: 9 - 7 = ?
1. Re - phrase the question: Instead of "9 take away 7," ask yourself, "How do I get from 7 to 9?" or "7 + what = 9?"
2. Start at the smaller number: Start at 7.
3. Count On until you reach the bigger number: Count up from 7 until you get to 9.
* "8, 9"
4. Count your steps: How many numbers did you say ? You said two numbers("8" and "9"), which means you took 2 steps.
5. The answer is 2! So, 9 - 7 = 2.It's like climbing a ladder from the 7th step to the 9th step. It only takes 2 more steps!
Try it
Let's practice finding the difference by counting on!
Instructions: For each problem, count on from the smaller number to the bigger number to find the answer.
Problem 1: 8 - 6 = ? * Think: "6 + what = 8?" * Start at 6 and count up to 8: "7, 8" * How many steps was that? ___
Problem 2: 7 - 5 = ? * Think: "5 + what = 7?" * Count on from 5: "___, ___" * Answer: ___
Problem 3: 10 - 8 = ? * Count on from 8 to 10. * Answer: ___
Problem 4: 9 - 8 = ? * This one is super fast! * Answer: ___
🏆 Strategy Choice: For which of these problems would "Counting On" be the FASTEST strategy? Circle it. * A) 10 - 2 * B) 10 - 8 * Why did you choose that one?