Subtracting 9

Learning Objectives Subtract 9 from any number between 9 and 20. Use the 'take away 10, add 1 back' strategy. Show subtracting 9 on a number line. Solve word problems that involve subtracting 9. Explain why subtracting 9 is like subtracting 10 and adding 1. Quickly recall subtraction facts for -9. You have 12 yummy cookies 🍪. If you share 9 with friends, how many are left for you? We will learn a super trick to make subtracting 9 easy and fast! This trick helps you solve problems in a snap. It is a math superpower! Real-World Applications Sharing 9 stickers from your collection of 15. Having 11 balloons and 9 fly away 🎈. Spending $9 from your $17 piggy bank money. Eating 9 grapes from a bunch of 14 🍇.

TermDefinitionExample SubtractTo take away some things from a group. The group gets smaller.12 apples 🍎 take away 9 apples leaves 3 apples. Minus Sign (-)This little line tells us to subtract. It looks like this: -The problem 14 - 9 uses a minus sign. DifferenceThe answer you get when you subtract one number from another.In 11 - 9 = 2, the difference is 2. Number LineA line with numbers in order. It helps us count and subtract.To find 13 - 9, you can start at 13 and jump back 9 spaces. Teen NumbersNumbers from 13 to 19. They all have a '1' in the tens place.13, 14, 15, 16, 17, 18, and 19 are teen numbers. The 'Plus One' TrickA fast way to subtract 9. You add 1 to the digit in the ones place.For 15 - 9, you look at the 5 and do 5 + 1 = 6. So, 15 - 9 = 6.

The 'Subtract 10, Add 1' Trick x - 9 = (x - 10) + 1 Subtracting 9 is tricky. Subtracting 10 is easy! So, take away 10, then just add 1 back. The 'Plus One' Ones Place Trick For a teen number 1x, the answer to 1x - 9 is 1 + x When you subtract 9 from a teen number, just add 1 to the number in the ones place. It's a shortcut! Number Line Jumps Start at the first number. Jump back 9 times. Use a number line to see the subtraction. Each jump backward is like taking one away.