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Exercises Numbers, fractions and percents

Example 1.14 from Prealgebra, 1.2 Add Whole Numbers

Add Whole Numbers: example 1.14

Model the addition: $17 + 26 .$

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
$17 + 26$ means the sum of 17 and 26.

Model the 17. 1 ten and 7 ones

Model the 26. 2 tens and 6 ones

Combine. 3 tens and 13 ones

Exchange 10 ones for 1 ten. 4 tens and 3 ones
$40 + 3 = 43$

We have shown that $17 + 26 = 43$

Your turn

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

Model each addition: $15 + 27 .$

How did it go?

PreviousAdd Whole Numbers: example 1.13 Next Add Whole Numbers: example 1.15

From Prealgebra (1st edition) by OpenStax (Rice University), section 1.2, 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.