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Exercises Numbers, fractions and percents

Example 1.40 from Prealgebra, 1.4 Multiply Whole Numbers

Multiply Whole Numbers: example 1.40

Model: $3 \times 8 .$

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Solution
To model the product $3 \times 8,$ we’ll start with a row of $8$ counters.

The other factor is $3,$ so we’ll make $3$ rows of $8$ counters.

Now we can count the result. There are $24$ counters in all.

$3 \times 8 = 24$

If you look at the counters sideways, you’ll see that we could have also made $8$ rows of $3$ counters. The product would have been the same. We’ll get back to this idea later.

Your turn

The book's Try It right after this example: same idea, new numbers. Only the answer is given.

Model each multiplication: $4 \times 6 .$

How did it go?

PreviousMultiply Whole Numbers: example 1.39 Next Multiply Whole Numbers: example 1.41

From Prealgebra (1st edition) by OpenStax (Rice University), section 1.4, licensed under CC BY 4.0. Original at openstax.org. We split the solution into steps; the words, numbers and figures are the book's. OpenStax doesn't endorse this site.