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1. Estimate the value of 98.5 x 13
Estimate the value of 102.3 divided by 4.7
2. 100 * 13 = 1300

100 / 5 = 20

just round up or down and do the calcualtion
3. (Original post by ghroaw2431)
Estimate the value of 98.5 x 13
Estimate the value of 102.3 divided by 4.7
for 98.5 x 13 => (100-1.5)x13= 1300-19.5=1280.5
for the second one it would be easier to use derivative estimation
but since u want an estimate, make it 102.5/5=20.5 , while the exact answer is = 21.7659574468

hope it helps
4. (Original post by ghroaw2431)
Estimate the value of 98.5 x 13
Estimate the value of 102.3 divided by 4.7
If this is GCSE maths, round your numbers to 1 significant figure and then do the very simple calculation.

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