# Concept Map

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# Textbook

## Useful websites

1. Surds starts with basic concepts,(to view the next page, please click on previous/up/next options in the bottom of the page
3. surds and other rootsThis page discusses surds and roots in detail.
4. Video on Surds from Youtube :simplifying surds,rationalising surds,dividing and multiplying surds

## Reference Questions

1. what is the meaning of surds?
2. Difference between like and unlike surds.
3. Meaning of Pure and mixed surds.
4. Simplification of rationalising the denominator.

# Teaching Outlines

## Concept 1: Definition of surds

### Learning objectives

1. know the meaning of surds
2. recognising radicand and order of surds

### Notes for teachers

If you can't simplify a number to remove a square root (or cube root etc) then it is a surd. If it is a root and irrational, it is a surd. But not all roots are surds.

1. Activity1

## Concept-2: Like and Unlike surds

### Learning objectives

1. Know the meaning of surd
2. recognising the meaning of order and radicand
3. Examples of like and unlike surds
4. To change surd to simplest form
5. Addition and Multiplication og surds

### Notes for teachers

1.Like surds: A group of surds having same order and same radicand in their simplest form. Example: $3\sqrt{5}, 7\sqrt{5}, x\sqrt{5}$
2.Unlike surds: Groups of surds having different orders or different radicandsor both in their simplest form. Example: $\sqrt{a}, 3\sqrt{2}, x\sqrt{5}$
3.Addition and sustraction of surds. Example: $2\sqrt{5}+3\sqrt{5}-\sqrt{5}$
4.Multiplication of surds. Example: $3} X 2\sqrt{5$

### Activities

1. Activity No:1 Like surds
1. Activity No:2 Unlike surds