Arithmetic Grade Four

Lesson One hundred and seventy-seven: MISSING SYMBOLS

Besides finding missing numbers in a problem, you can also find missing symbols. For instance consider this problem. 


        5 __ 5 = 10
You can quickly recognize that the missing symbol is a plus sign since the only way the answer could be 10 is to add the two fives.

Here are some more examples. 

 
      PROBLEM			MISSING SYMBOL
    -------------------+------------------------
      5 __ 2 = 7       |          +
      5 __ 2 = 3       |          -
      10 __ 11 = 21    |          +
      21 __ 11 = 10    |          -
      45 __ 15 = 30    |          -
      22 __ 23 = 45    |          +
                       |
Now you get to try a few of these yourself.

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