Subtracting 8

Learning Objectives Subtract 8 from numbers up to 20. Use a number line to model subtracting 8. Use the 'count back' strategy to find the difference. Use the 'make a ten' strategy for subtracting 8. Solve word problems that involve subtracting 8. Explain how addition can help with subtraction (fact families). You have 10 yummy cookies 🍪. If you share 8 with your friends, how many are left for you? Today, we will become experts at taking away 8! We will learn cool tricks to make subtracting 8 super easy and fun. Let's get started! Real-World Applications Sharing 8 toys with a friend. Eating 8 grapes from a bunch. Spending $8 from your piggy bank. Seeing 8 birds fly away from a tree.

TermDefinitionExample SubtractTo take away some things from a group. The group gets smaller.12 apples 🍎 subtract 8 apples leaves 4 apples. Minus Sign (-)This little line tells us to subtract! It means 'take away'.We read `10 - 8` as 'ten minus eight'. DifferenceThe answer you get when you subtract one number from another.In `11 - 8 = 3`, the difference is 3. Counting BackA way to subtract by counting backwards from the bigger number.For `12 - 8`, you start at 12 and count back 8 times: 11, 10, 9, 8, 7, 6, 5, 4. Number LineA line with numbers on it. It helps us see how to add and subtract.To find `15 - 8`, you start at 15 and jump back 8 spaces. 🐸 Make a TenA smart trick to break down subtraction problems to make them easier.For `14 - 8`, first do `14 - 4 = 10`. Then...

Counting Back Strategy Start at the big number and count back 8 times. Use this when you can easily count backwards. It's like taking 8 steps back. Make a Ten Strategy For `15 - 8`, think: `15 - 5 = 10`, then `10 - 3 = 7`. Use this for bigger numbers. First, jump back to 10. Then, jump back the rest of the way. Thinking Addition Strategy To solve `12 - 8`, think `8 + ? = 12`. Use this if you know your addition facts well. It's like solving a puzzle backwards!