Mathematics - Term 4 - Week 7

Addition is the process of combining two or more numbers to find their total, while subtraction involves taking one number away from another. To visualize these operations, we can use number lines, counters, or bar models. For example, when adding 3 + 5, we can start at 3 on a number line and move 5 steps to the right, landing on 8. Conversely, for subtraction, if we have 8 - 3, we start at 8 and move 3 steps to the left, landing on 5. This visual representation helps solidify the concepts.

Let's solve the problem 47 + 36. We can break it down: First, add the tens: 40 + 30 = 70. Next, add the units: 7 + 6 = 13. Now, combine these results: 70 + 13 = 83. Therefore, 47 + 36 = 83.

Consider the problem 92 - 47. Start by subtracting the tens: 90 - 40 = 50. Then, subtract the units: 2 - 7 requires borrowing, so we take 1 from the 9, making it 8, and the 2 becomes 12. Now, 12 - 7 = 5. Combine these results: 50 + 5 = 45. Thus, 92 - 47 = 45.

Now, let's practice together. Solve the following problems: 1) 58 + 24, 2) 73 - 29. For each problem, use a number line or draw a bar model to visualize your solution. After solving, share your answers with a partner and discuss the strategies you used.

Complete the following problems on your own: 1) 65 + 48, 2) 84 - 37, 3) 29 + 56, 4) 100 - 45. Show all your working clearly. After finishing, review your answers and check for any mistakes. If you find errors, try to identify where you went wrong and correct your approach.

• 53
• 63
• 73
• 83

Answer: 63

34 + 29 equals 63 when you add the tens and units separately.

• 47
• 57
• 67
• 37

Answer: 47

75 - 28 equals 47 after borrowing from the tens place.

Answer: 75

Adding 56 and 19 gives 75.

Answer: 45

Subtracting 45 from 90 results in 45.

• 90
• 100
• 80
• 70

Answer: 100

88 + 12 equals 100.

• 35
• 25
• 45
• 55

Answer: 35

64 - 29 equals 35 after performing the subtraction.

Answer: 57

The sum of 23 and 34 is 57.

Answer: 33

100 - 67 equals 33.