Subtraction facts - numbers up to 18

Learning Objectives Subtract a one-digit number from a two-digit number up to 18. Use a number line to solve subtraction problems. Use counting back as a subtraction strategy. Relate subtraction to addition facts. Solve simple word problems involving subtraction up to 18. Quickly recall subtraction facts from 18. You have 12 yummy cookies. 🍪 If you share 3 with a friend, how many are left for you? We will learn how to take away numbers. This is called subtraction! It helps us know how much is left. Real-World Applications Sharing your toys with a friend. Eating some of your snacks. Giving away some of your stickers. Counting down to a fun event.

TermDefinitionExample SubtractionSubtraction means to take away from a group. We find out how many are left. ➖If you have 5 apples 🍎🍎🍎🍎🍎 and eat 2, you have 3 left. That's subtraction! MinuendThis is the big number you start with before taking any away.In 15 - 5, the number 15 is the minuend. It's the whole group. SubtrahendThis is the number of things you are taking away.In 15 - 5, the number 5 is the subtrahend. It's the part you remove. DifferenceThe difference is the answer in a subtraction problem. It's what is left!In 15 - 5 = 10, the number 10 is the difference. ✅ Fact FamilyA group of math facts that use the same numbers. They are like a family! 👨‍👩‍👧For numbers 4, 5, 9: 4+5=9, 5+4=9, 9-5=4, 9-4=5. Counting BackA way to subtract by counting backwards...

Subtracting Zero Rule a - 0 = a When you take away zero, the number stays the same. Nothing changes! ✨ Subtracting Itself Rule a - a = 0 When you take away a number from itself, you always get zero. All gone! 💨 Addition Helps Subtraction If a - b = c, then b + c = a You can use addition facts to check your subtraction. They are opposites!