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II Integer patterns II II II I calculator, RM9

If you press j+1-I after a positive number,
it changes it to a negative number.
Some calculators use other symbols
for the j+t-1 key, such as -x .
Check that your calculator has a key like I +/-I .

ITJ • Follow the instructions on this card to program your calculator.
. ~ .
. Press DI II • • II II
Press Et.

• Press = five times and write down the sequence of numbers.
• Write down the sequence of numbers you think the calculator
will display if you press i:::J tive more times.
• Check your answers with your calculator.

~ Repeat ITJ using each of these cards.

a b
Press m II •• II m .
Press 1111 .

c d Press m It •• II m

Press It 11.

e Press m 1111 a a II m f Press m Ii •• II m

Press 11 fi. Press a El II.

@] Copy and complete these sequences.

a 12, 6, • . -6, • . • b -17,-10, • , • . • .18
c -24, -14, • • • • • . 26 d 34,23, 12, • . • . •

Design cards to show how you can program your calculator to display
each of the sequences in @] .

Now try RM9.

I STEPS 5:4 I