Fri Sep 23rd - Estimating

LEARNING OBJECTIVE: Apply the rules of estimation to solve problems

SUCCESS CRITERIA: You will be able to round numbers to 10, 100, 1000 and the use the estimations to solve problems

STARTER:

Explain why these calculations must be wrong:

1. 23 x 24 =1053
   
2. 19 x 59 = 121
   

Estimate the answers to these calculations

1. (21.3 + 48.7)/6.4
   
2. 31.2 x 48.5
   
3. 359 ÷ 42
   

LESSON: Show how to use inverse operations to check answers

EG Is 450 ÷ 6 = 75

Is 310 – 59 = 249

Is 1320.7 ÷ 23.9 = 97.35

Now continue to work through Exercise 2D on Page 21 of Year 7 Book 2

PLENARY: checking answers to Questions from Text Book, Have a go at this 10 question quiz (Needs 10 mins)