MATHEMATICS2 Q2 8 illustrate subtraction of 2-digit by 1-digit .pptx

Matatag Mathematics

1. Subtracting with Number Lines: A Fun Journey Backwards!

2. Welcome to Subtraction Adventure! Today we're going on a math adventure! We'll learn how to subtract using number lines It's like taking steps backward on a path Are you ready to explore?

3. What is Subtraction? Subtraction means taking away It's the opposite of adding When we subtract, our number gets smaller Can you think of times when you subtract in real life?

4. Meet the Number Line This is a number line It shows numbers in order from left to right We can use it to help us subtract What number do you see at the start of this line?

5. Subtracting on the Number Line To subtract, we move left on the number line Each jump left is like taking away 1 The number we land on is our answer Let's try an example together!

6. Example: 15 - 3 Start at 15 on the number line We need to subtract 3, so jump left 3 times Where did we land? That's right, we landed on 12!

7. Your Turn: 18 - 4 Start at 18 on your imaginary number line How many jumps left will you make? Where will you land? Share your answer with a friend!

8. Subtracting Bigger Numbers We can use number lines for bigger numbers too Let's try 45 - 7 Start at 45 and jump left 7 times What's the answer?

9. Subtraction as the Opposite of Addition Subtraction and addition are like best friends They're opposites, but they work together If 8 + 5 = 13, then 13 - 5 = 8 Can you think of another example?

10. Addition and Subtraction Families Numbers can be in families For example: 7, 3, and 10 are a family 7 + 3 = 10 and 10 - 3 = 7 Can you make your own number family?

11. Fact Families Game Let's play a game with fact families I'll give you three numbers You make two addition and two subtraction sentences Ready? Here's your first family: 6, 4, 10

12. Subtraction Stories Subtraction happens in real life too Like when you share cookies with friends If you have 12 cookies and give 5 away, how many are left? Can you think of your own subtraction story?

13. Number Line Hop Let's play Number Line Hop! Stand up and imagine you're on a big number line I'll give you a subtraction problem You hop left to show the answer

14. Inverse Operations Addition and subtraction are inverse operations This means they undo each other If you add 5 and then subtract 5, you're back where you started It's like putting on a jacket and then taking it off again

15. Checking Subtraction with Addition We can use addition to check our subtraction If 15 - 6 = 9, then 9 + 6 should equal 15 Try it yourself: 20 - 8 = 12, so 12 + 8 should equal...?

16. Mental Math: Subtracting 1 Subtracting 1 is easy! It's just the number that comes before What's 17 - 1? How about 23 - 1?

17. Mental Math: Subtracting 10 Subtracting 10 is like going back one ten The ones digit stays the same What's 45 - 10? Now try 78 - 10

18. Subtraction Patterns Look at a 100 chart What happens when you subtract 1? What about when you subtract 10? Can you see any patterns?

19. Welcome to Number Line Land! Today we're going on a math adventure! We'll learn how to subtract using number lines It's like taking steps backward on a path Are you ready to explore?

20. What is Subtraction? Subtraction means taking away It's the opposite of adding When we subtract, our number gets smaller Can you think of times when you subtract in real life?

21. Meet the Number Line This is a number line It shows numbers in order from left to right We can use it to help us subtract What number do you see at the start of this line?

22. Hopping Backwards To subtract on a number line, we hop backwards Each hop back is like taking away 1 The number we land on is our answer Let's try an example together!

23. Let's Subtract: 7 - 3 Start at 7 on the number line We need to subtract 3, so hop back 3 times Where did we land? That's right, we landed on 4!

24. Your Turn: 9 - 5 Start at 9 on your imaginary number line How many hops back will you make? Where will you land? Share your answer with a friend!

25. Subtracting Zero What happens when we subtract zero? Start at any number on the line How many hops back do we take? The number doesn't change!

26. Number Line Neighborhoods Numbers on a line are like houses in a neighborhood When we subtract, we move to a house on the left How many houses do we pass when we do 8 - 2? Can you show this move on your own number line?

27. Subtraction Stories Subtraction happens in real life too Like when you share cookies with friends If you have 10 cookies and give 4 away, how many are left? Can you think of your own subtraction story?

28. Number Line Hop Game Let's play Number Line Hop! Stand up and imagine you're on a big number line I'll give you a subtraction problem You hop left to show the answer

29. Subtracting One Subtracting 1 is easy! It's just the number that comes before What's 6 - 1? How about 12 - 1?

30. Subtracting Two When we subtract 2, we hop back twice Start at 8 and subtract 2 Where do you land? Now try 15 - 2

31. Number Line Treasure Hunt Imagine the number line is a treasure map You start at 20 and need to go back 7 steps Where does the treasure hide? Create your own treasure hunt problem!

32. Fact Families on the Number Line Numbers can be in families For example: 2, 3, and 5 are a family Show 5 - 3 = 2 on the number line Now show 5 - 2 = 3

33. Subtracting to Zero Sometimes we subtract until we reach zero Start at 5 and keep subtracting 1 How many times did you subtract? Try this with a different starting number

34. Number Line Frog Jumps Imagine a frog on lily pads with numbers The frog starts on pad 10 and jumps back 4 pads Which pad does the frog land on? Draw your own frog jump subtraction!

35. Subtraction Patterns Let's subtract 2 from different numbers Start with 10 - 2, then 9 - 2, 8 - 2, and so on What pattern do you notice in the answers? Can you explain why this pattern happens?

36. Missing Number Mysteries Sometimes we know the result but not what we subtracted For example: 10 - ? = 7 Use the number line to solve the mystery Create your own missing number problem for a friend

37. Number Line Race Partner up for a number line race! One person gives a subtraction problem The other rushes to show it on a number line Switch roles and play again

38. Wrapping Up Our Number Line Adventure We've learned to subtract using number lines Remember, subtracting is like hopping backwards You can use this for any subtraction problem Keep practicing and have fun with numbers!

39. Question 1 Look at the number line. If you start at 8 and move 3 jumps to the left, what number do you land on? Circle your answer: A) 7 B) 6 C) 5 D) 4

40. Question 2 Freddy Frog starts on lily pad number 15. He hops backwards 6 times. Which lily pad does he end up on? Write your answer: _______

41. Question 3 Fill in the blank: 12 - ____ = 8 Hint: Use your imaginary number line to help you!

42. Question 4 Sally has 10 cookies. She gives 3 to her friend. How many cookies does Sally have left? Draw a number line to solve this problem, then write your answer: _______

43. Question 5 Circle the correct answer: When you subtract 1 from a number, you get: A) The number that comes after B) The number that comes before C) The same number D) Zero

44. Question 6 On the number line, show 18 - 5 by drawing jumps. What number do you land on? Write your answer: _______

45. Question 7 Complete this fact family: ___ + 4 = 11 11 - 4 = ___ 4 + ___ = 11 11 - ___ = 4

46. Question 8 Super Sam is flying at speed 20. He slows down by 7. What is his new speed? Use a number line to help you solve, then write your answer: _______

47. Question 9 True or False? Circle your answer. When you subtract 10 from a number, only the tens digit changes. TRUE FALSE

48. Question 10 Emily is playing hopscotch. She's on square 14 and needs to hop backwards 8 times. What square will she land on? Draw a number line to help you solve, then write your answer: _______

49. Answer Key Question 1: C) 5 Question 2: 9 Question 3: 4 Question 4: 7 Question 5: B) The number that comes before Question 6: 13 Question 7: 7 + 4 = 11, 11 - 4 = 7, 4 + 7 = 11, 11 - 7 = 4 Question 8: 13 Question 9: TRUE Question 10: 6