Tips And Tricks

Question 0

How do you square any two did get number like 43?

Answer 0

First square each value and put in the correct order.
4X4=16. 3x3=09. This produces 1609
Then multiply the two digits together.
4x3=12
Double and answer in step two and add a 0 to the end.
240
Add this to the value you got for the first step
240+1609=1849

Question 1

How do you square a number ending in 5?

Answer 1

Multiply the first value by itself plus one.
Add 25 to the end.
E.g. 75 X 75 =5625
7X8 = 56
56+25=5625

Question 2

How do you multiply a number by 5. Use 27

Answer 2

First divide by 2
27/2 = 13.5
Multiply this by 10
135

Question 3

How do you multiply a number by 25. Use 44

Answer 3

Multiply by 100
4400
Then divide it by 4
1100

Question 4

How do you divide a number by 5? Use 223

Answer 4

First multiply it by 2
446
Then divide by 10
44.6

Question 5

How do you decide if a number is divisible by 6? Use 947244

Answer 5

First make sure it is an even number.
If it is add all the digits together 
30
Divide this by 3
10 
If you get a whole number, like here, it is a multiple of 6

Question 6

How do you tell if a number is evenly divisible by 11? Use 2832346

Answer 6

First minus the one’s digit from the rest of the number.
283234-6=283228
Do this again.
28322-8= 28314
Continue to do this.
If the end result is 0 is is divisible by 11

Question 7

How do you test if a number is divisible by 12? Use 1324536

Answer 7

First divide the last two digits by 4
36/4 is 9
If this is a whole number add all the digits together.
24
Then divide this by 3
8
If you get a whole number, it is divisible by 12