Multiplication Tricks

When you multiply by 0, the product is always zero.

5 x 0 = 0           0 x 26 = 0

When you multiply by 1, the product will always be the other number.

3 x 1 = 3            1 x 56 = 56

When multiplying by 2, you double the other number.

8 x 2 = 16          5 x 2 = 10

6 trick” – Take the other number you are multiplying and hold up that many fingers.  Count by 5s on each of those fingers and then go back and count by 1s.

9 mental trick” – Take one away from the other number, then say what number + that number = 9.

9 hand trick” – Bend finger down corresponding to the number x 9. Then count the fingers on the left of bent finger and then right of bent finger.

Divisibility Rules

A number is divisible by:

2 – if it is even

3 – if the digits add up to 3 or a multiple of 3

6 – if it is divisible by 2 and 3.

5 – if it ends in 0 or 5

9 – if it is divisible by 3

10 – if it ends in 0.

 Converting between Metric numbers

Kids Have Dropped  Over dead converting metrics

Kilo Heckto Decka   units deci centi milli

This is a pneumonic that will help children learn how to convert numbers within the metric system.

The “O” stands for the units begin converted, etc. liters, meters, …

So if you wanted to change this sentence you could use a “U” instead of an “O”.

Order of Operations

1) Do all Exponents first

2) Do all calculations within parentheses

2) Do all multiplication and division from left to right

3) Do all addition and subtraction from left to right


Reducing fractions – find the GCF (greatest common factor) of both numbers and divide both top and bottom.  (on board)

Adding and Subtracting fractions, you need to have common denominators.  If the denominators are the same, you add the top numbers and keep the bottom numbers the same.

To get common denominators you find the smallest number that both denominators will go into.  Then change the top and bottom of both fractions.  (on board)  The rule to remember is: if you do it to the bottom you have to do the same to the top.

Then you can add the top numbers.

Multiplying fractions, you multiply both the top and bottom numbers.  Then reduce.

Dividing fractions, you change the division symbol to X and flip the second fraction and then multiply and reduce.

 Resources – one of my favorite place to print math worksheets 

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The Schedule for the next several weeks is

Feb. 14th – Famous Artists lapbook/notebook

Feb. 21st – Making edible earth layer

(fun projects for the children)

Feb. 28th – Reading Response Activities