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3.1: What’s My Rule? Mental Math Solve the fact problems. Write your answer on your slate. 30 + 50 = 80 - 40 = 42 + 20 = 75 - 20 = 98 + 22 = 66 – 41 = Math Message Each person in the United States uses about 50 gallons of water per day. Use this information to complete the “What’s My Rule?” table in your notebook. In (days) 1 6 10 30 365 Out (gallons) 50 300 500 1,500 18,250 What is the rule? X 50 In (days) 1 6 10 30 365 Out (gallons) 50 300 500 1,500 18,250 What do the numbers in the in (input) column represent? What do the numbers in the out (output) column represent? How are the input and output columns related? Variations of the “What’s My Rule” Routine Rule Rule Rule Subtract 15 Add 100 Multiply by 7 _________ In 30 90 65 110 Out In 15 250 75 20 15 565 95 321 Out 350 120 665 421 In 7 2 9 600 Out 49 14 63 4,200 Other variations of “What’s My Rule?” Rule Rule Divide by 6 A pound of nuts cost $3.75 In 54 42 24 600 Out 9 7 4 100 Pounds 1 2 5 Cost $3.75 $7.50 $18.75 11 $41.25 Math Journal page 53 Do #1-2 on your own. Do #3-6 with your math partner. Wrap it UP! • Fill in this “What’s My Rule” table Rule Divide by 4 In 100 16 24 Out 25 4 12 3 4 1 6 Tonight’s Homework ALSO: Put initials on and cut out your x, / triangles (activity sheets 1-4 in math journal). Bring back to school tomorrow. Math Boxes