options: Apply and extend previous understandings of addition and subtraction to add and subtract rational numbers; represent addition and subtraction on a horizontal or vertical number line diagram.

Solve real-world and mathematical problems involving the four operations with rational numbers. (Computations with rational numbers extend the rules for manipulating fractions to complex fractions.)

Apply and extend previous understandings of multiplication and division and of fractions to multiply and divide rational numbers.
problem_activity: Problem 1
Point
A
is located at
$$-4.5$$
, and point
B
is
$$3.25$$
units from point
A
. Write two addition equations that could be used to determine the location of point
B
. Model this on the number line below.
[IMG]
Problem 2
Find the sums.
a.
$${-3+ \left (-2 {1\over4} \right )}$$
b.
$${5.7 + (-12.2)}$$
c.
$${-9 + 3 {2\over5}}$$
d.
$${-{10\over3} + 18}$$
e.
$${-2+3+(-1)+5}$$


correct_option_index: 0