Evaluating expressions
Types of exercises: value of an expression with one letter, value of an expression with two letters, value of an expression with a bracket, using a formula.
Exercises are drawn at random from a large bank - every click gives a different set.
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Find the value of the expression for k = 5
8k + 5
Find the value of the expression for n = 12
8 · (n + 12)
Problem
The price of a taxi ride (in zloty) is given by the formula c = 3 · k + 7, where k is the number of kilometres travelled. How much does a 20 km ride cost?
Find the value of the expression for a = 7, b = 3
3a + 4b
Find the value of the expression for x = 12
8x − 4
Find the value of the expression for n = 22
2 · (n − 11)
Problem
The number of matchsticks needed to make figure number n is given by the formula z = 5 · n + 1. How many matchsticks are needed to make figure number 21?
Find the value of the expression for a = 3, b = 7
5a − 2b
Find the value of the expression for b = 3
6b + 5
Find the value of the expression for x = 16
8 · (x − 10)
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