Number section

Question 1

BIDMAS

Answer 1

Brackets, Indices, Division, Multiplication, Addition, Subtraction.
Use for order of operations.

Question 2

Multiply by 10

Answer 2

Move decimal point one space to the right. E.g. 23.6=236.

Or add a zero on the end if no decimal point E.g. 45x 10=450

Question 3

Divide by 100

Answer 3

Move decimal point two places to the left e.g 34.5/100=0.345

Question 4

Divide by 20

Answer 4

Divide by 2 first then divide by 10

Question 5

Multiply by 300

Answer 5

Times by 3 then times by 100

Question 6

Negative number multiplied by negative number =

Answer 6

Positive number

Question 7

Positive number multiplied by negative number =

Answer 7

Negative number

Question 8

5 - -4=

Answer 8

5+4=9

Question 9

Divide a decimal by a whole number

Answer 9

Use bus stop method. Put decimal point on top of bus stop.

Question 10

Divide a number by a decimal

Answer 10

Write as fraction. Then times by 10, 100 etc to get rid of decimal point.

Question 11

The first prime number is

Answer 11

2. It is NOT 1!!!!!

Question 12

The only even prime number is

Answer 12

2.

Question 13

How to find a prime number from a list of numbers.

Answer 13

Get rid of all the even numbers and anything ending in a 5. Then divide by 3 and 7, if it doesn’t divide by either it is prime.

Question 14

First 4 prime numbers

Answer 14

2,3,5,7

Question 15

What is a multiple?

Answer 15

Just the times table of a number. Eg first 4 multiples of 2 are 2,4,6,8

Question 16

What is a factor?

Answer 16

All the numbers that divide into another number. Eg 4 is a factor of 24 as you can divide 24 by 4

Question 17

What is an integer?

Answer 17

A whole number

Question 18

How to multiply fractions

Answer 18

Just multiply top numbers together, then multiply bottom numbers together

Question 19

How to divide fractions

Answer 19

Switch the second fraction to upside down then multiply

Question 20

How to add or subtract fractions

Answer 20

Need to put both fractions over the same bottom number (common denominator) then add or subtract bottom numbers

Question 21

How to change a decimal to a percentage

Answer 21

Times by 100

Question 22

How to change a percentage to a decimal

Answer 22

Divide by 100

Question 23

Estimating without using a calculator

Answer 23

Round all numbers in calculation to 1 significant figure

Question 24

When multiplying numbers with indices

Answer 24

Add the powers. Eg 3^4 x 3^6 = 3^10.

Question 25

When dividing numbers with indices

Answer 25

Subtract the powers

Question 26

13 x 13

Answer 26

169

Question 27

14 x 14

Answer 27

196

Question 28

15 x 15

Answer 28

225