14
Target
1
00
Junior high school
• • • • • • • • • • • • • • • • • • • • • Objective • • • • • • • • • • • • • • • • • • • • •
Understand and use the concept of place value in whole numbers and decimals, relating this to
computation.
Calculate with decimals and understand the results; e.g. multiplying by numbers between 0 and
1
.
Mentally estimate and approximate solutions to numerical calculations.
• • • • • • • • • • • • • • • Explanation of the activity • • • • • • • • • • • • • •
A game for two players.
• Player
1
enters any 2-digit number into the calculator.
• Player 2 then multiplies this by another number so that the answer is as close as possible to
1
00.
• Players score points according to how close they are to
1
00:
within
1
0 =
1
point
within 5 = 2 points
within
1
= 5 points
exactly
1
00 =
1
0 points
• Player 2 then enters a number and the game continues.
• The first player to score 20 points wins.
While working on this activity, students will be extending their understanding of decimals and
improving their estimation skills.
• • • • • • • • • • • • • • • • • Using the calculator • • • • • • • • • • • • • • • • •
Calculator functions used: Multiplication
Example:
Player
1
enters 28.
28
Player 2 multiplies this by 3.5.
3.5
Player 2 scores two points.
The game continues until one player reaches 20 points.
Press the following buttons and then start operation.
DEG
28X3.5=
DEG
Summary of Contents for EL-531RH
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