Which sign (+ or -) makes the number sentence true?

Learn with an example

✈️ Which sign is missing?

17 ___ 3 = 20

  • +
  • –
  • Try both the plus sign and the minus sign.
  • First try the plus sign:17 + 3 = 20
  • Now try the minus sign:17 − 3 = 14
  • The plus sign gives the right answer.

✈️ Which sign is missing?

11__ 7 = 18

  • +
  • –
  • Try both the plus sign and the minus sign.
  • First try the plus sign11 + 7 = 18
  • Now try the minus sign: 11 − 7 = 4
  • The plus sign gives the right answer.

✈️ Which sign is missing?

15 ___ 4 = 19

  • +
  • –
  • Try both the plus sign and the minus sign.
  • First try the plus sign:15 + 4 = 19
  • Now try the minus sign:15 − 4 = 11
  • The plus sign gives the right answer.

Let’s practice!🖊️