Expressing missing number problems algebraically
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Lesson details
Key learning points
- In this lesson, we will be exploring various problems and representing them using algebra.
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This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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5 Questions
Q1.
t + 7 = 20 What is the value of t?
t = 10
t = 12
t = 27
Q2.
If 5a = 35 What is the value of a?
30
40
6
Q3.
How could we express the perimeter of the rectangle below?
4a
a + b
ab
Q4.
How could we express the perimeter of the square below?
2r
r + 4
r + s
Q5.
If 2f + 6= 20. What is the value of f?
6
8
9
4 Questions
Q1.
Which expression would represent the following problem: The cooking time for roast beef is 30 minutes for every kg plus an additional 15 minutes.
a = 500b + 30
Q2.
Which expression would represent the following problem: The cost of a photo album book is £2.50 for binding and printing with an additional cost of 15p per photograph.
a = 250b + 15
Q3.
Which expression would represent the following problem: A singer makes money from selling music. They pay a one-off fee of £25.00 to Oak-Tunes for marketing and distribution costs and receive 55p for each copy of the album sold.
a = 25 + 0.55
a = 2500 + 55a
Q4.
Instead of writing 5 x a in an algebraic expression, what could I write instead?
5 + a
a5