Make and Justify Estimates. What is the value… 0?20.955 2.4-5 -0.42.4 4.4 3.35.

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Presentation transcript:

Make and Justify Estimates

What is the value… 0?

Estimating answers A farmer has 404 cows. 128 of them have been milked. About how many are left to be milked? Which is a better estimate: 400 – 100 = 300or 400 – 130 = 270 Why? Actual answer = 276

Estimating answers A small lawn is 7.5m by 2.5m. Roughly what is its area? Which is a better estimate: 7 x 3or8 x 3or 7 x 2or8 x 2 What are the lowest and highest values? The answer is between 7x2=14 and 8x3=24 Actual answer 7.5x2.5 = 18.75m 2

Try estimating these Christmas trees at £4.95 each 48 people climb the Eiffel Tower at €3.80 each 12 diskettes with 1.44Mb each 28 ambulances at £12,750 £ € Mb £229,500

Using long multiplication 673 x 24 ≈ 700 x 20 = 14, x =673x =673x

Using multiplication facts If 673 x 24 = what is: 673 x 2.4 = x 24 = x 2.4 =

Using multiplication facts If 26 x 19 = 494 what is: 2.6 x 1.9 = x 19 = x 1.9 = 0.494