Lesson details

Key learning points

  1. In this lesson, we will learn how to subtract one surd from another where no prior simplification is needed.In these cases, the surds will all have the same root.

Licence

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3 Questions

Q1.
Which number is not a surd?
√2
Correct answer: √4
√5
√7
Q2.
Simplify 6√7+5√7
√7
11√14
Correct answer: 11√7
30√7
Q3.
A piece of wood has been cut up into three equal pieces as shown. What was the original total length of the piece of wood?
4√5
6√15
Correct answer: 6√5
8√5

3 Questions

Q1.
Simplify 6√2 - 4√2
√2
10√2
2
Correct answer: 2√2
Q2.
Simplify 6√7 - 5√7
Correct answer: √7
11√14
30√7
Option 4
Q3.
A piece of wood is shown. It is 7√5 m long. A piece of length 2√5 m is cut away. How long is the piece of wood now?
14√5 m
15√5 m
Correct answer: 5√5 m
9√5 m

Lesson appears in

UnitMaths / Adding surds