Types of numbers

Using any or all of the figures: 1, 2, 5, 9 Which is; 1) the smallest prime number? 2) a prime number greater than 20? 3) a prime number between 10 and 20? 4) two prime numbers whose sum is 21? 5) a number that is not a prime?

1) 2 2) 29 3) 19 4) 19+2 5) 15

Which of these are rational or irrational? 1. 6/2 2. Root of 16 3. Root of 5 4. 3/8 5. Cube root of 25 6. 0.2413

1. Rational 2. Rational 3. Irrational 4. Rational 5. Irrational 6. Rational

On a certain day the temperature at midday was 14*C. By midnight the temperature had fallen by 17*C. what was the temperature at midnight?

14-17= -3*C

What are the first 10 square numbers?

1x1= 1 2x2= 4 3x3= 9 4x4= 16 5x5= 25 6x6= 36 7x7= 49 8x8= 64 9x9= 81 10x10= 100

What are the crucial cube roots?

1x1x1= 1 2x2x2= 8 3x3x3= 27 4x4x4= 64 5x5x5= 125 10x10x10= 1000

What are the prime numbers?

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43.... A prime number is a number which doesn't divide by anything- apart from itself and 1.

Sarah thinks of a number. She calculates that the square of the number is 256. What is the square root of the number?

4

What is an Integer?

It is another name for a whole number. It can be either positive, negative or zero.

What is a multiple of a times table?

It is just its times tables.

What is a factor of a number?

It is numbers that divide into a number.

What is a Rational number?

Rational numbers can be written as fractions. They come in 3 different forms: -Integers e.g 4 (4/1) -Fractions e.g 1/4 or 1/2 -Recurring decimals e.g 0.333333333

Which is bigger? The sixth odd number, the fourth square number or the second cube number?

The fourth square number (16)

Which is bigger? The third odd number, the third square number or the third cube number?

The third cube number (27)

What is an Irrational number?

They are never ending and cannot be written as a fraction. These can be the root of 2, the root of 3 and pi.