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How can I find the unknown number in a number sentence? May 2, 2013

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Pop Quiz 1. What is the unknown number in the following number sentences? n + 12 = 16 45 - _____ = 34 x 9 = 72108 ÷ 9 = 2. What do we call the symbols that represent the unknown number? n = 4 11 8 12 Variables

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Are symbols that represent unknowns in a number sentence. They can be shapes, pictures, letters and fill-in-the-blanks.

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The case of the missing number. Use your resources to help you solve each case.

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Case 1 Gift Bags Sara and James are making gift bags for their party guest. If they have 36 party favors, how many gift bags can they fill if they are putting 3 favors in each bag? Clues 36 party favors 3 favors per bag How many bags can they fill 36 ÷ 3 = or X 3= 36 12

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Case 2 Dog Days Clues Spot spots a squirrel and decides to chase after it. If he chases 5 squirrels per hour how many will he chase in 6 hours? 5 squirrels per hour How many will he chase in 6 hours? 5 x 6 = Or ÷ 5 = 6 30

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Case 3 Monkey Business Margo Monkey has a bunch of 35 bananas to share with her friends. If there are six friends plus herself how many bananas will everyone get? Y o u ’ r e o n y o u r o w n n o w s u p e r m a t h s l e u t h s. R e m e m b e r t o w r i t e d o w n y o u r c l u e s a n d t h e p r o b l e m y o u n e e d t o s o l v e. Can you close this case?

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Case 3 Monkey Business Margo Monkey has a bunch of 35 bananas to share with her friends. If there are six friends plus herself how many bananas will everyone get? Can you close this case? Clues 35 bananas to share 6 friends plus self…hmmm 6+1 =7 How many will everyone get? 35 ÷ 7 = 5 = YOU DID IT!

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