1. ESTI - MYSTERIES Estimation Meets Math Mysteries Esti – Mystery
“The Smaller
Numbers Request”
Steve Wyborney

2. Before seeing the clues, estimate how many erasers are in the cup.
As the clues appear, use the information to narrow the possibilities to a smaller set. Then use estimation to determine which of the remaining answers is the most reasonable.
Steve Wyborney

3. Clue #1 Clue #2 Clue #3 Clue #4 Clue #5
Count by 2’s from 2 to 30. The answer is one of those numbers.
Clue #2
The answer is
greater than 10.
Clue #2
Clue #3
Clue #3
The answer is less than 30.
Clue #4
One of the digits is a 4.
Clue #4
Clue #5
Clue #5
There are now two possibilities.
Which one do you think it is?
Steve Wyborney

4. By combining the clues and estimation, you now have enough information to determine the answer.
Steve Wyborney

5. 24 erasers The Reveal Click to see the answer. Steve Wyborney

6. “The Smaller Numbers Request” The Estimation Clipboard
Esti - Mysteries
“The Smaller Numbers Request”
Click here (or on the image) to download more Esti – Mysteries.
Other Downloadable Resources
50 Splat! Lessons
(for PowerPoint)
20 Fraction
Splat! Lessons
(for PowerPoint)
80 Cube Conversations
Lessons
100 Subitizing Slides
&
10 Challenge Patterns
The Estimation Clipboard
Splat!
for Google Slides