### Home > CC1MN > Chapter 2 Unit 2 > Lesson CC1: 2.2.1 > Problem2-28

2-28.

1. $9.67 + 49.7 + 5.22$

Add the numbers in the hundredths place.

Add the numbers in the tenths place. Since the sum is 2 digits, place the first digit (1) in the column to the left.

Add the numbers in the ones place. Since the sum is 2 digits, place the first digit (2) in the column to the left.

Add the numbers in the tens place.

$\left. \begin{array} { r } { 9.67 } \\ { 49.70 } \\ { + \quad 5.22 } \\ \hline \end{array} \right.$

$\left. \begin{array} { r } { 9.67 } \\ { 49.70 } \\ { + \quad 5.22 } \\ \hline 9 \end{array} \right.$

$\left. \begin{array} { r } { ^19.67 } \\ { 49.70 } \\ { + \quad 5.22 } \\ \hline 59 \end{array} \right.$

$\left. \begin{array} { r } { ^19.67 } \\ { ^249.70 } \\ { + \quad 5.22 } \\ \hline 4.59 \end{array} \right.$

$\left. \begin{array} { r } { ^19.67 } \\ { ^249.70 } \\ { + \quad 5.22 } \\ \hline 64.59 \end{array} \right.$

1. $4.2+1.903$

See part (a). Be careful to line up the decimals correctly.

1. $97.1 - 35.04$

• Since 0 is less than 4 in the hundreths place, borrow 1 from the column to the left, making the hundredths place 10 − 4 = 6.

Now the tenths place is 0 − 0 = 0.

Subtract the numbers in the ones place.

Subtract the numbers in the tens place.

$\left. \begin{array} { } { 97.1 } \\ { - 35.04 } \\ \hline \end{array} \right.$

$\left. \begin{array} { } \quad \small01\\{ 97.\cancel10 } \\ { - 35.04 } \\ \hline \quad \quad \quad {6}\end{array} \right.$

$\left. \begin{array} { } \quad \small01\\{ 97.\cancel10 } \\ { - 35.04 } \\ \hline \quad \quad {06}\end{array} \right.$

$\left. \begin{array} \quad \small01\\{ 97.\cancel10 } \\ { -35.04 } \\ \hline \quad {2.06}\end{array} \right.$

$\left. \begin{array} \quad \small01\\{ 97.\cancel10 } \\ { -35.04 } \\ \hline \quad {62.06}\end{array} \right.$