Sharp EL-531RH, Руководство для учителей

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5
Junior high school
(1) Enter a 3-digit number.
(2) Knock down one digit, or pin; i.e. change the last digit
to a 0, except this time, do so by adding a number to
the last digit to make it 0.
(3) Knock down the next pin; i.e. change the tens column
digit to 0.
(4) Knock down the pin of the hundreds column.
B: Using addition
Number Bowling
• • • • • • • • • • • Using the activity in the classroom • • • • • • • • • • •
This activity is a good game for students to play in pairs.
One student enters a number in the calculator, and the other student has to knock each digit, or
“pin,” down.
Example:
638 - 8 = 630
630 - 30 = 600
600 - 600 = 0
• • • • • • • • • • • • • • • Points for students to discuss • • • • • • • • • • • • • •
It is important for students to talk about what they are doing and use the appropriate language, for
example: “six hundred and thirty, minus thirty, equals six hundred.” Students should be challenged
to vary the starting point; i.e. sometimes starting with the hundreds digit and sometimes with the
tens digit.
Further Ideas
• Play the game using 2-, 4-, or 5-digit numbers according to the ability of the students.
2
60
300
Press the following buttons and then start operation.
638
638=
DEG
ANS+2=
DEG
ANS+60=
DEG
ANS+300=
DEG