By John Rome R. Aranas

MULTIPLICATION OF WHOLE NUMBERS

MULTIPLICATION

Multiplication is also known as REPEATED ADDITION.

How to Multiply?For 1-digit multiplier: For 2-digit multiplier:

¿325¿×61,950

31 ¿124¿×73372

+8,6809,052

Multiplication Made Easy!1) For multiplying 10, 100, and 1,000Just add: 1 zero for 10;

2 zeroes for 100, and; 3 zeroes for 1,000

Ex.

Multiplication Made Easy!

More examples

Multiplication Made Easy!

2) For multiplying multiples of 10Ex. - Remove the zeroes at the end

first.

- Multiply

Multiplication Made Easy!

- Then, add the zeroes removed.

More examples:

Multiplication Made Easy!

3) For Rounding-off Products:- Round-off each factor to the nearest place value

¿592¿×34𝑁

¿600¿×30𝑁

Multiplication Made Easy!- Multiply

- Therefore, 18,000 is the REASONABLE ANSWER to the given equation.

¿600¿×3018,000

Multiplication Made Easy!

Give the REASONABLE ANSWER in the following equations:

Word ProblemsFor Multiplication:Times EveryAt this rate As many asDoubled (x2) Tripled (x3)ProductSquared (raised to two)Cubed (raised to three)

ExampleYosh was able to harvest 45 sacks of rice in his farm. If each sack of rice weighs 50 kilograms, find the total weight of rice he harvested.

ESA Method

E: 45×50=𝑁S: 45

×5000

+2,2502,250

A: 2,250 kilograms

45×5225

h𝑡 𝑒𝑛 ,2,250or

Example

Breil bought 32 packs of chocolate. Each pack contains 15 chocolate bars. How many bars of chocolate did he buy?

ESA Method

E: 32×15=𝑁S: 32

×15160

+320480

A: 480 chocolate bars

Try this!Bea treated the class with 23 boxes of pizza. If each box of pizza has 6 slices, how many slices of pizza were there altogether?

ESA Method

E: S:

A: