Here is a code that I used to test the Uno against the Teensy 3.0. If you make this array larger: float sinanswers[401] and make the two "for" loops larger too, you can make the sketch much bigger. I had to settle on 400 to make it fit the Uno easily enough.
If you like, you can use the other math processes to perform other tasks and make the sketch bigger.
[code]
float sinanswers[401];
unsigned long time1 = 0;
unsigned long time2 = 0;
void setup()
{
Serial.begin(9600); // USB is always 12 Mbit/sec
delay(1000);
Serial.print("Here");
delay(4000);
time1 = micros();
for (int i = 0; i < 400; i++)
{
sinanswers[i] = sin(i);
}
time2 = micros();
unsigned long elapsed = time2 - time1;
for (int i = 0; i < 400; i++)
{
Serial.println(sinanswers[i]);
Serial.print(" ");
Serial.println(i);
}
Serial.print("time elasped = ");
Serial.print(elapsed);
Serial.print(" micros");
}
void loop()
{
}
[/code]