Understanding irrational numbers

Find the best estimate for √18 .

Look at the number line.

• 4.2

• 4.4

• 5.1

• 4

Between which two whole numbers is the 
√20 ?

• 5 and 6
• 10 and 2
• 4 and 5
• 3 and 4

• -4 and -5

• -5 and -6

• -6 and -7

• -7 and -8

What decimal would NOT come between √ 144 and √ 169 on a number line?

• 12.1

• 12.4

• 12.7

• 13.2

What two integers is the square root of 115 between?

• 9 and 10
• 10 and 11
• 11 and 12
• 12 and 13

The √20 is between which two consecutive integers? 

• 19 and 21
• 2 and 3
• 5 and 6
• 4 and 5

Approximate to the nearest tenth.  $\sqrt{19}$  

• 4.1

• 4.4

• 4.6

• 4.8

The √20 is between which two integers?

• 4 & 5

• 3 & 4

√44 is between which two perfect squares?

• 6 and 7

• 5 and 6

• 7 and 8

• 8 and 9

What numbers replace the question marks?  (click to see the problem)

• 65 and 75
• 9 and 10
• 10 and 11
• 11 and 12