Create a tic tac toe table and list out the numbers 1 to 9 from the top right corner.

• Step 1. Put 0, 1, 2 in front of the first row
  
• Step 2. Add 2, 3, 4 in the second row
  
• Step 3. Add 4, 5, 6 in the third row

Idiom: A piece of cake
Meaning:  This idiom is used to describe a task, job or other activity that can be accomplished very easily, just like serving a slice of cake, very simple and pleasant.

Examples: 

• My homework is a piece of cake; I can finish it within an hour.
  
• Riding a bike is a piece of cake.
  

To multiply two 2-digit numbers without showing work, first multiply the ones digits together, then 'cross-multiply,' and finally multiply the tens digits together.

Make sure to carry whenever a product exceeds 9. As you will see in the examples below, you must work your way from right to left to perform this trick.


Example 1: 12 x 23

1. Multiply the ones digits: 1x4=4 (ones digits answer).
2. Cross-multiply and add: (3x4)+(1x2)=14 (use the 4 as the tens-digit answer, and carry the 1).
3. Multiply the tens digits, and add the 1: (3x2)+1=7 (hundreds-digit answer).
4. Combine: 744 (the answer).

Note: 
This trick will also work on numbers with zeroes and decimal points. Also as you are cross-multiplying, it is generally easier to begin with the larger product and then add the smaller product.

Proverb: A bird in the hand is worth two in the bush
Meaning: You use this proverb to say it is better to accept something that you have or you can use now than to try to get something better that you might not be able to obtain. Sometimes people just say, "A bird in the hand."

If someone says, "A bird in the hand is worth two in the bush," he/she means that it is better to be satisfied with something you have than to risk losing it by trying to get something better you may not succeed in getting.

Example:
If I were you, I'd accept the job. It might not be the best job for you, but a bird in the hand is worth two in the bush.

A percentage is a way of expressing a number as a fraction of 100 (per cent meaning “per hundred” in Latin). It is often denoted using the percent sign, “%”, or the abbreviation “pct”. For example, 45% (read as “forty-five percent”) is equal to 45/100, or 0.45.

Percentages are used to express how large/small one quantity is, relative to another quantity. The first quantity usually represents a part of, or a change in, the second quantity, which should be greater than zero. For example, an increase of $ 0.15 on a price of $ 2.50 is an increase by a fraction of 0.15/2.50 = 0.06. Expressed as a percentage, this is therefore a 6% increase.

Remember that:

• 100% of a number is the SAME number.
  
• Less than 100% of a number makes the number SMALLER.
  
• More than 100% of a number makes the number LARGER.
  

Note that 200% of a number is the DOUBLE of the number and 300% of a number is the TRIPLE of the same number. 

Example: Let's consider the number 50.

• 100% of 50 is 50 (SAME)
• 200% of 50 is 100 (DOUBLE)
• 300% of 50 is 150 (TRIPLE)

Example: 225% of 24

• 200% of 24 is 48 (DOUBLE)
  
• 25% of 24 is one fourth of 24, that is to say 24 x 1/4 = 6
• 225% of 24 is the sum of 48 and 6, hence 54 

The video below shows an alternative method to calculate the percent of a number.