Discuss with your friends and teacher the strategies you could use when estimating a number of items.
Extension activities:
Copy and paste your table of results into a spreadsheet then investigate the following:
- What is the average time it took you to make your estimate?
- Is your estimate more likely to be higher or lower than the actual number of items?
- Is there a correlation between the number of items and your percentage error?
- Can you work out the formula the computer uses to calculate your score?
- Can you get better at estimating with practice?
Suggested
Moon Measure

Estimate (do not measure) the distance from A to B on the image of the surface of the moon.
The short web address is:
Transum.org/go/?Num=1150
Suggested
Estimating Percentages

Estimate the percentages represented by the diagrams.
The short web address is:
Transum.org/go/?Num=235
Suggested
Estimate Powers and Roots

Estimate the powers and roots of the given positive numbers.
The short web address is:
Transum.org/go/?Num=709
Suggested
Estimating Angles

Estimate the size of the given acute angles in degrees.
The short web address is:
Transum.org/go/?Num=208
Suggested
Animal Records

Match the values and the units to the animal world records.
The short web address is:
Transum.org/go/?Num=1091
Suggested
Estimation Golf

Play a round of golf using your estimation skills rather than golf clubs.
The short web address is:
Transum.org/go/?Num=290
Here is an excerpt from the Transum podcast that considers strategies for counting sheep: