Math
Math
Mysteries
Case of the Missing Sums
Detective, your assignment is to solve the case of the missing sums
by adding to find the missing sums.
1. Place the stack of flash cards face-down on a table.
2. Set a timer or watch to record the time it takes to answer all cards.
3. Turn over each card and answer each problem.
4. If your answer is correct, place it in your pile. If you answer incorrectly, place it in a different pile.
5. When you have finished with all the cards, stop the timer.
6. Count up how many you answered correctly, and how many you answered incorrectly.
7. Try again later to beat your time!
-----------------------
To solve this mystery, you will need:
Set of flash cards
Number Line (optional)
4
+0
1
+5
9
+2
Watch “We Can Add By Counting On” on the DVD before solving this case.
8
+6
................
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