Question

Решить пример 2 способами 42-25=

Answer 1

42-25=17

17+25=42

Так?

Если нет,то вот

42-25=17

42+(-25)=17

Answer 2

42-25=17
17+25=42
42+(-25)= -17

Answer 3

Sure! Let's solve the equation using two different methods:

Method 1: Subtraction

42 - 25 = 17

Method 2: Addition (Complementary addition)

To find the result using complementary addition, we can add a number to 25 to get to the nearest multiple of 10 (which is 30), and then add the remaining difference to 42.

Step 1: Add 5 to 25 to get to the nearest multiple of 10. 25 + 5 = 30

Step 2: Add the remaining difference (12) to 30. 30 + 12 = 42

So, 42 - 25 = 17

Both methods give us the same result: 17.