Year 9 Computing — Procedures that take values and give one back

1.A procedure named grow takes a number and gives back that number plus a tenth of it. Which of these calls gives 55?

• a) grow(60)
• b) grow(50)
• c) grow(55)
• d) grow(45)

2.One call sits inside another here. What number does it print?

def double(x):
    return x * 2

print(double(double(3)))

3.This procedure doubles whatever it is handed. What number does it print?

def double(x):
    return x * 2

print(double(7))

4.Two calls happen one after the other here. What number does it print?

def treble(x):
    return x * 3

a = treble(3)
b = treble(a)
print(b)

5.A procedure named gap takes two numbers and gives back the first one take away the second. Exactly one of these calls gives 6. Which?

• a) gap(10, 4)
• b) gap(4, 6)
• c) gap(6, 6)
• d) gap(4, 10)

6.A procedure named step takes a number and gives back 100 take away that number multiplied by itself. Put these calls in order of the value each one gives, smallest first.

• step(7)
• step(2)
• step(3)
• step(5)

7.A procedure named area takes a length and a width and gives back one multiplied by the other. Match each call to the value it gives.

8.This procedure has a loop inside it. What number does it print?

def upto(n):
    total = 0
    for k in range(1, n + 1):
        total = total + k
    return total

print(upto(5))