**Task List - Problems to
attempt with certain calculators**
- Regular Calculator
- Without using the "5" key,
how would you calculate 18 x 25 on your calculator?
- Without using the "0" key,
how would you calculate 22 x 40 on your calculator?
- Without using the "2"
key, how would you calculate 50/2 on your calculator?
- Without using the "5"
key, how would you calculate 50/5 on your calculator?
- Without using the "5" key
or the "^" key, how would you calculate 5^4 or 5
^{4} on
your calculator?
- Without using the "2" key,
how would you calculate 18 x 25 on your calculator?
- 121/11 without the "1" key
(Kalata, Williams, Charbonneau, Martin, Kyte)?
- 5^164 without a "5" key
(Pinta, Clark, Kocinski, Gorman)?
- 8,642,557 + 67,892,560 with
only a "1" key (Kalata, Williams, Charbonneau, Martin, Kyte)
?
- 37 * 21 without a "3"
or "7" keys (Walraven, Spivak, Zanger, Petraitis, Sagliano)
or without
a 3 or / keys?

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