Addition and subtraction (1)

Letters for numbers

Name: ______________________________Date: ______________Score: ______ / 20

1.
d stands for a dice score. If d = 5, what is d + 4?
2.
If d = 5, what is 4 + d?
3.
If d = 6, what is 6 - d?
4.
The perimeter of a square is p = 4 × s, where s is the side length. What is the value of p when s = 5?
cm
5.
The perimeter of a square is p = 4 × s. What is the value of p when s = 6?
cm
6.
The perimeter of a square is p = 4 × s. What is the value of s when p = 20?
cm
7.
For a rectangle where s + t = 10, if s = 4, what is t?
cm
8.
d + 4 is equal to 4 + d.
True False
9.
Which pair of expressions are NOT equal?
1. Ad + 4 and 4 + d
2. B2 + d and d + 2
3. C5 - d and d - 5
4. Da + b and b + a
10.
Two strips of card a and b are placed end to end. b is 3 cm longer than a and the total length is 15 cm. What is the value of a?
cm
11.
For the three strips, m + n = 10 and n = 7. What is the value of m?
cm
12.
Martha buys 2 more pairs of socks (y) than shoes (x). Which number sentence links x, y and 2?
1. Ay = x + 2
2. Bx = y + 2
3. Cy = x - 2
4. Dy = x + 4
13.
a, b and c are whole numbers from 1 upwards, and a + b + c = 7. If a = 2 and b = 2, what is c?
14.
A letter like s can stand for different numbers, so it is called a variable.
True False
15.
What number comes just before 33?
16.
In the number 97, what is the tens digit?
17.
What comes next? 53, 55, 57, 59, …
18.
What number comes just before 49?
19.
What number comes just after 94?
20.
In the number 66, what is the ones digit?

Answer key

Addition and subtraction (1) — Letters for numbers