Target 100 - Sharp EL-531RH Teachers Manual

Target 100

• • • • • • • • • • • • • • • • • • • • • 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 100.
• Players score points according to how close they are to 100:
within 10 = 1 point
within 5 = 2 points
within 1 = 5 points
exactly 100 = 10 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 • • • • • • • • • • • • • • • • •
Press the following buttons and then start operation.
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.
Calculator functions used: Multiplication
14
Junior high school
DEG
DEG
28X3.5=