Answer :
Let's evaluate each of the statements to determine which are true about adding 56 and 25 mentally:
1. 56 is 4 less than 60.
- If you add 4 to 56, you get 60. Therefore, 56 is indeed 4 less than 60. This statement is true.
2. 25 can be broken into 4 + 21.
- By breaking down 25 into parts, we can see that adding 4 and 21 gives us 25. This breakdown is correct. So, this statement is true.
3. 56 + 4 + 25 is the same as 56 + 25.
- First, calculate 56 + 4 + 25:
- First, add 56 and 4, which is 60.
- Then add 25 to 60, which equals 85.
- Now, calculate 56 + 25 directly:
- This sum is 81.
- Since 85 does not equal 81, this statement is false.
4. 56 + 4 + 21 is the same as 56 + 25.
- First, calculate 56 + 4 + 21:
- Add 56 and 4, which is 60.
- Then add 21 to 60, which equals 81.
- Now, calculate 56 + 25 directly:
- This sum also equals 81.
- Since both calculations give 81, this statement is true.
5. 56 + 25 = 81.
- When you add 56 and 25 directly, you indeed get 81. This statement is true.
In summary, the statements that are true are:
- 56 is 4 less than 60.
- 25 can be broken into 4 + 21.
- 56 + 4 + 21 is the same as 56 + 25.
- 56 + 25 = 81.
1. 56 is 4 less than 60.
- If you add 4 to 56, you get 60. Therefore, 56 is indeed 4 less than 60. This statement is true.
2. 25 can be broken into 4 + 21.
- By breaking down 25 into parts, we can see that adding 4 and 21 gives us 25. This breakdown is correct. So, this statement is true.
3. 56 + 4 + 25 is the same as 56 + 25.
- First, calculate 56 + 4 + 25:
- First, add 56 and 4, which is 60.
- Then add 25 to 60, which equals 85.
- Now, calculate 56 + 25 directly:
- This sum is 81.
- Since 85 does not equal 81, this statement is false.
4. 56 + 4 + 21 is the same as 56 + 25.
- First, calculate 56 + 4 + 21:
- Add 56 and 4, which is 60.
- Then add 21 to 60, which equals 81.
- Now, calculate 56 + 25 directly:
- This sum also equals 81.
- Since both calculations give 81, this statement is true.
5. 56 + 25 = 81.
- When you add 56 and 25 directly, you indeed get 81. This statement is true.
In summary, the statements that are true are:
- 56 is 4 less than 60.
- 25 can be broken into 4 + 21.
- 56 + 4 + 21 is the same as 56 + 25.
- 56 + 25 = 81.
