Subtracting Strategies

Which are the correct steps for rewriting a subtraction problem into addition?

• Keep first number the same
  Change Subtraction sign
  Change second number to opposite

• Keep first number the same
  Change Subtraction into Addition
  Change second number to opposite

• Change the first number into the opposite
  Change Subtraction to Addition
  Keep second number the same

• Change the first number into the opposite
  Change Subtraction to Addition
  Change second number to opposite

What about when we subtract a negative number?

• -1

• 1

• 9

• -9

What is the answer to -2 - 8?

• -10

• 10

• 6

• -6

A subtraction sign means I will move ________on the number line.

• right

• left

• 396
• 414
• 596
• 386

• 279
• 269
• 331
• 278

• 239
• 230
• 170
• 160

15 - 21

• 6

• 26

• -6

• -26

What problem is shown with this number line?

• 3 - 2

• 2 - 3

• 3 - (-2)

• 5 - 2

-3 - 2

• -1

• -5

• 1

• 6