Subtract doubles

Learning Objectives Identify a doubles subtraction problem like 10 - 5. Recall addition doubles facts up to 10 + 10. Solve doubles subtraction problems within 20. Explain that subtracting a double is like finding half. Use pictures or objects to show a doubles subtraction problem. Write the number sentence for a doubles subtraction problem. You have 6 yummy cookies 🍪. You share 3 with a friend. How many are left for you? We will learn a super fast math trick! It is called subtracting doubles. Knowing your addition doubles helps you subtract super quickly. Real-World Applications Sharing 8 crayons 🖍️ with a friend, so you both get 4. Having 10 fingers 🙌 and putting 5 behind your back. Splitting 4 toy cars 🚗 with your sibling, so you each get 2. Eating half of yo...

TermDefinitionExample SubtractSubtract means to take away. The number gets smaller.5 - 2 = 3. You take 2 away from 5. DoubleA double is a number added to itself.4 + 4 is a double. The answer is 8. Doubles FactAn addition math problem where the two numbers are the same.3 + 3 = 6 is a doubles fact. HalfHalf is one of two equal parts of a whole.If you have 8 stickers, half is 4 stickers. Number SentenceA math problem written with numbers and signs like + or -.12 - 6 = 6 is a number sentence. DifferenceThe difference is the answer you get when you subtract.In 10 - 5 = 5, the difference is 5.

The Doubles Subtraction Rule (a + a) - a = a If you subtract a number from its double, the answer is that same number. The 'Think Addition' Rule If a + a = b, then b - a = a Use the addition double you know to solve the subtraction problem.