Mathematics - Term 2 - Week 1

Addition is the process of finding the total or sum by combining two or more numbers. Subtraction, on the other hand, involves taking one number away from another to find the difference. To visualize these operations, we can use number lines, counters, or drawings. For example, if we have 5 apples and we add 3 more, we can represent this on a number line by starting at 5 and moving 3 steps to the right, landing on 8. Conversely, if we have 8 apples and we take away 3, we move 3 steps to the left on the number line, landing on 5.

Let's solve the problem: 27 + 46. First, we can break down the numbers into tens and units: 27 is 20 + 7, and 46 is 40 + 6. Adding the tens together gives us 20 + 40 = 60. Next, we add the units: 7 + 6 = 13. Now, we combine these results: 60 + 13 = 73. Therefore, 27 + 46 = 73.

Now, let's look at the subtraction problem: 85 - 29. We can break down 29 into 20 + 9. First, we subtract the tens: 85 - 20 = 65. Then, we subtract the units: 65 - 9. To do this, we can think of 65 as 60 + 5. So, 60 - 9 = 51, and we have 51 + 5 = 56. Thus, 85 - 29 = 56.

Let's work through some problems together. First, try adding 34 + 58. Break it down into tens and units. Next, solve 72 - 18. Again, break it down into tens and units. After you solve these, share your answers with a partner and explain your thought process. Discuss any differences in your methods and how you arrived at your answers.

Now it's your turn to practice on your own. Solve the following problems: 45 + 37, 90 - 24, 56 + 19, and 100 - 33. Show all your working steps clearly. Once you finish, check your answers with a peer and discuss any mistakes you might have made. Reflect on how you can correct those mistakes.

• 42
• 41
• 43
• 40

Answer: 42

23 + 19 equals 42 when you add the tens and units together.

• 27
• 28
• 29
• 30

Answer: 27

56 - 29 equals 27 after breaking down the numbers and subtracting.

Answer: 123

Adding 78 and 45 gives a total of 123.

Answer: 53

Subtracting 47 from 100 results in 53.

• 62
• 61
• 60
• 63

Answer: 62

34 + 28 equals 62.

• 45
• 50
• 55
• 60

Answer: 45

90 - 45 equals 45.

Answer: 102

The sum of 65 and 37 is 102.

Answer: 55

Subtracting 33 from 88 results in 55.