Transcript Space invaders

Space Invaders
Unit 1 Activity 2
Aliens = 539
First shot – 9
Aliens left = 530
Second shot - 30
Aliens left = 500
Third shot - 500
Aliens left = 0
Game 1
•Choose a two-digit number and ‘shoot’
the aliens down one at a time using
subtraction.
Record your moves carefully.
•Choose some other numbers and repeat.
•Choose another two-digit number and
try again using addition.
Your final number should be 100.
Game 2
•Choose a 3, 4 or 5-digit number and
repeat Game 1.
Shoot down the digits by working from
right to left.
•Try again shooting them down from left to
right .
When you are using addition with the 3
digits the final number should be 1000;
For 4 digits it should be 10,000.
Remember to record your moves carefully.
Investigation 1
Your ‘alien’ number is 724.63
Shoot it down using subtraction and starting
with the 3
Record your moves
Try again using addition
You final number should be 1000
Find some other ways of shooting down
724.63
Investigation 2
Choose a decimal number of your own
with at least 6 digits and 2 decimal
places
Shoot it down in exactly 4 moves using
subtraction.
Record your moves
Find some other ways of shooting down
your number.
Repeat using other numbers.