Example 1.2 from Prealgebra, 1.1 Introduction to Whole Numbers

Introduction to Whole Numbers: example 1.2

Use place value notation to find the value of the number modeled by the $base-10$ blocks shown.

An image consisting of three items. The first item is two squares of 100 blocks each, 10 blocks wide and 10 blocks tall. The second item is one horizontal rod containing 10 blocks. The third item is 5 individual blocks.

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
There are $2$ hundreds squares, which is $200 .$

There is $1$ tens rod, which is $10 .$

There are $5$ ones blocks, which is $5 .$

Digit Place value Number Value Total value

$2$ hundreds $2$ $100$ $200$

$1$ tens $1$ $10$ $10$

$5$ ones $5$ $1$ $+ 5$

$215$

The $base-10$ blocks model the number $215 .$

Your turn

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

Use place value notation to find the value of the number modeled by the $base-10$ blocks shown.

An image consisting of three items. The first item is a square of 100, 10 blocks wide and 10 blocks tall. The second item is 7 horizontal rods containing 10 blocks each. The third item is 6 individual blocks.

How did it go?