Complete the Sentence - Missing Pieces to 100
𧩠The puzzle has a hole! There is a number missing right in the middle of the math sentence. Use your detective skills to find it.
Do this: Read the concept below, then try the quiz or activity.
Concept
Missing number problems look terrifying. 45 + ___ = 82. What?! Don't worry, there are rules to crack the code.
π― The Missing Number Rules:
Missing addition? ( 45 + ___ = 82 ) * Do the OPPOSITE! To find what is missing between 45 and 82, just subtract! * 82 - 45 = Target -> (82 - 45 = 37). The missing number is 37!
Missing subtraction? ( 82 - ___ = 45 ) * If the piece missing is in the middle... just subtract! * 82 - 45 = Target -> The missing number is 37!
Missing the START of a subtraction? ( ___ - 37 = 45 ) * If the very first, biggest number is missing, you have to ADD the two pieces back together to find out how big it used to be! * 45 + 37 = Target -> The giant starting number was 82!
Try it
Crack the code!
Instructions: Choose the right rule to find the missing piece.
Problem 1: 50 + ___ = 86 * Rule: Subtract the total minus the starting piece! (86 - 50 = ?). * Answer: ___
Problem 2: 95 - ___ = 70 * Rule: Subtract! (95 - 70 = ?). * Answer: ___
Problem 3: ___ - 25 = 40 * Rule: The massive start number is missing! Add the pieces back together! (40 + 25 = ?). * Answer: ___
Problem 4: ___ + 38 = 90 * (Bonus Rule: Same as problem 1! Subtract from the total! 90 - 38 = ?). * Answer: ___