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Friday 22 November 2013

My math strategies, Working out

 Mineus. There were 225 people at the movies than 8 had to leave. How many were left?
225 - 8 = 217    225 - 5 = 220   220 - 3 = 217     
                                                                                                                                     


Fraction. John has a pizza he has cut into 16 pieces? He eats some then leaves ¾ of the pizza for the rest of the family How many slices did he eat and how many are left for the family?
= 4,  4 times 4 = 16 so john has eaten 4 pizza’s and left 4 more


Multiplication.  Tessa has bought 40 mini chocolate bars to put in goodie bags at her party. She has 8 goodie bags. How many does she need to put in each?
= 5 because 5 times 8 = 40 and she puts 5 mini chocolate bars in each goodie bag


Addition. Trevor has to drive 422 km’s. He looks at his odometer and sees he has gone 289 kms. How much further has he got to go?
422 - ? = 289       289 - ? = 422     
289 + 1 = 290    290 + 10 = 300   300 +122 = 422
122 + 10 + 1 = 133



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