int getal=55;
unsigned long timeb=0;
unsigned long timee=0;

void setup() {
  Serial.begin(9600);
  timeb=micros();
  getal=getal+getal;
  timee=micros();
  Serial.print("time voor +=");
  Serial.println(timee-timeb);
  timeb=micros();
  getal=getal*getal;
  timee=micros();
  Serial.print("time voor *=");
  Serial.println(timee-timeb);
  timeb=micros();
  getal=getal/getal;
  timee=micros();
  Serial.print("time voor /=");
  Serial.println(timee-timeb);
}

void loop() {
  // put your main code here, to run repeatedly:

}