Addition and subtraction (T1 W3)
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Addition is the process of finding the total or sum by combining two or more numbers. For example, if you have 3 apples and you get 2 more, you can find the total by adding: 3 + 2 = 5 apples. Subtraction, on the other hand, is the process of taking away a number from another. For instance, if you have 5 apples and you give away 2, you can find out how many you have left by subtracting: 5 - 2 = 3 apples. Both operations are fundamental in mathematics and are often used together in problem-solving.
Let's solve the problem: 47 + 36. First, we can break down the numbers into tens and units. 47 has 4 tens and 7 units, while 36 has 3 tens and 6 units. Adding the tens together: 40 + 30 = 70. Now, adding the units: 7 + 6 = 13. Finally, we combine the two results: 70 + 13 = 83. Therefore, 47 + 36 = 83.
Now, let's look at a subtraction problem: 85 - 29. We can break this down as well. Start with the units: 5 - 9 cannot be done, so we need to borrow 1 from the tens. This makes it 15 - 9 = 6. Now, for the tens: 7 - 2 = 5. Combining these results gives us 56. Thus, 85 - 29 = 56.
Let's practice addition together. Solve the following problem: 58 + 27. Start by breaking down the numbers into tens and units. What do you get when you add the tens? And what about the units? Share your answers with the class, and we will discuss the steps together.
Now, let's try a subtraction problem: 72 - 34. Again, break it down into tens and units. What happens when you subtract the units? Do you need to borrow? Work through it step by step and be ready to explain your reasoning to your partner.
Now it's your turn to practice on your own. Solve the following problems: 64 + 19 and 91 - 46. Remember to show your working clearly. Once you finish, check your answers with a partner and discuss any mistakes you might have made.
Answer: 38
Adding 23 and 15 gives a total of 38.
Answer: 27
Subtracting 29 from 56 results in 27.
Answer: 77
When you add 45 and 32, the total is 77.
Answer: 36
Subtracting 54 from 90 gives you 36.
Answer: 100
Adding 78 and 22 equals 100.
Answer: 36
Subtracting 27 from 63 results in 36.
Answer: 35
50 - 15 equals 35.
Answer: 80
34 + 46 equals 80.