WEEK 4

MULTIPLICATION WITH OR WITHOUT REGROUPING

Let's watch this video to learn multiply numbers without regrouping.

Here's another video to watch and let's learn about multiplying numbers with regrouping.

To multiply a one digit factor and a number, multiply the factor by ones digit of the number, then by the tens digit, and so on.
To multiply a two-digit factor and a number , multiply all pairs of digits from the factors and put their products on their corresponding place values, then add the partial products.
To multiply numbers by column, put the factor with fewer digits below the greater factor. Multiply each digit in the lower by each digit in the upper factors starting from right. Use regrouping in necessary.
To multiply numbers by multiples of 10, 100, and 1 000, simply follow these steps:

Multiply the nonzero digits of the given factors.
Count the number of zeros in the factors and append as many zeros to the product as there are in the factors

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