Grade 8 Computer Science — 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(50)
• b) grow(60)
• c) grow(45)
• d) grow(55)

2.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))

3.This procedure is handed two values rather than one. What number does it print?

def add(a, b):
    return a + b

print(add(4, 9))

4.A procedure named triple takes one number and gives back three times it. Sort each call by whether the value it gives is more than 20.

5.Follow this code by hand. What is total at the end?

def add(a, b):
    return a + b

total = 0
for n in range(1, 5):
    total = add(total, n)

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

def double(x):
    return x * 2

print(double(double(3)))

7.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(2)
• step(7)
• step(3)
• step(5)

8.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.