Elements of algebra
writing a situation as an expression, evaluating expressions with one and two letters, perimeters from a formula, simple equations, word problems
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Find the value of the expression for k = 11
9k + 12
Problem
Which description matches the formula Ob = 2 · a + 2 · b?
Problem
The number of matchsticks needed to make figure number n is given by the formula z = 6 · n + 1. How many matchsticks are needed to make figure number 22?
Problem
A triangle has sides of length x, x + 1 and 2x. The side lengths are in centimetres. Find its perimeter when x = 11.
Solve the equation
x + 8 = 23
Find the value of the expression for a = 6, b = 3
6a − 2b
Write the perimeter as an expression
An equilateral triangle has sides of length x + 9. Write its perimeter as the sum of the side lengths.
Choose the expression that matches the text
Philip has x zloty. Adam has 9 times as much as Philip. How many zloty does Adam have?
Choose the expression that matches the text
Sophie has x zloty. Michael has half of what Sophie has and another 7 zloty. Which expression shows how many zloty Michael has?
Problem
I thought of a number, multiplied it by 8 and subtracted 14. The result was 2. What number did I think of?
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