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Common Core Standards
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3 MB|16 pages
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Students must use their addition and regrouping within 100 math skills to solve the case of the Angry Adder!

NEW - Editable Items list added to the packet. This way you can change the item names and alter the mystery outcome. There are also two alternative pre-made lists you can use instead. This is a great option if your students have already done this mystery story before and you need to change the mystery answer.

There are 5 clues to crack to solve the mystery:

Clue 1: Horizontal Addition (Within 20)
Clue 2: Adding Doubles (Few challenger questions at the end)
Clue 3: Addition Input/Output Tables (apply the rule given)
Clue 4: Addition Algorithms (Within 100 - No Regrouping)
Clue 5: Addition Algorithms (Within 100 - With Regrouping)

Pack also includes a mystery declaration sheet, answer sheets, elimination guide and awards.

See a list of all the Math Mysteries HERE

Mrs J.

2.OA.B.2 Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
2.NBT.B.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Total Pages
16 pages
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