Write the addition form and follow the addition rule to answer each subtraction problem. | | ADDITION FORM | SUM/DIFFERENCE | |---|--------------|----------------| | 1) 20 - 8 | | | | 2) 15 - 30 | | | | 3) 28 - 16 | | | | 4) 14 - 16 | | | | 5) -8 - 10 | | | | 6) -12 - 17 | | | | 7) 23 - (-2) | | | | 8) -17 - (-10) | | | | 9) -9 - (-3) | | | | 10) 34 - (-12) | | | MIXED OPERATIONS (Addition and Subtraction) Perform the indicated operations. 10 + (-11) + 5 + (-5) = 6) -7 - 1 - 10 =

To solve these subtraction problems by converting them to addition problems, we use the rule that subtracting a number is the same as adding its opposite. Here's how it's done for each problem:

20 − 8 Addition Form: 20 + ( − 8 ) Sum/Difference: 20 − 8 = 12

15 − 30 Addition Form: 15 + ( − 30 ) Sum/Difference: 15 − 30 = − 15

28 − 16 Addition Form: 28 + ( − 16 ) Sum/Difference: 28 − 16 = 12

14 − 16 Addition Form: 14 + ( − 16 ) Sum/Difference: 14 − 16 = − 2

− 8 − 10 Addition Form: − 8 + ( − 10 ) Sum/Difference: − 8 − 10 = − 18

− 12 − 17 Addition Form: − 12 + ( − 17 ) Sum/Difference: − 12 − 17 = − 29

23 − ( − 2 ) Addition Form: 23 + 2 Sum/Difference: 23 − ( − 2 ) = 25

− 17 − ( − 10 ) Addition Form: − 17 + 10 Sum/Difference: − 17 − ( − 10 ) = − 7

− 9 − ( − 3 ) Addition Form: − 9 + 3 Sum/Difference: − 9 − ( − 3 ) = − 6

34 − ( − 12 ) Addition Form: 34 + 12 Sum/Difference: 34 − ( − 12 ) = 46


For mixed operations:

10 + ( − 11 ) + 5 + ( − 5 ) Sum/Difference: Begin by adding the positive numbers: 10 + 5 = 15 Then add the negative numbers: 15 + ( − 11 ) = 4 Finally: 4 + ( − 5 ) = − 1

− 7 − 1 − 10 Addition Form: − 7 + ( − 1 ) + ( − 10 ) Sum/Difference: Add the negative numbers: − 7 + ( − 1 ) = − 8 Then: − 8 + ( − 10 ) = − 18


This method relies on understanding that subtraction can be rewritten as the addition of the opposite, making calculations more straightforward, especially when dealing with negative numbers.

Answered by RyanHarmon181 | 2025-07-20