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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

High School Mathematics - 2
1.8 Radicals - Conjugate Surds

a - b is the conjugate of a + .

Example: Rationalise the denominator1/(5-3).
Solution: (1/5-3) x (5+3/5+3
Answer: (5 + 3)/22

Example: Find the rational number equivalent of 2.44.
Solution:

  1. Let x = 2.44---1
  2. Multiply both sides by 100.
  3. 10 x = 24.4---2
  4. Subtract equation 2 from 1
  5. 9x = 22
Answer : 22/9
Directions: Solve the following.
Q 1: Find the rational number equivalent of2.16*
13/6
13/5
12/8

Q 2: Rationalise the denominator 1/(3+2-5)
(32 + 23 + 1
2

Q 3: Find the rational number equivalent of 0.272727.
1/9
3/11
1/5

Q 4: Is 1/5 a rational?
No
Yes

Q 5: Given 3 = 1.732, 5 = 2.2366/(3, find 6/(5-3)
12.1
11.5
11.904

Q 6: Is 22/7 rational?
Yes
No

Q 7:
Answer:

Q 8: Find the rational number equivalent of 0.13333...
2/15
1/3
2/3

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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