Math  201819
6.5c  Add, Subtract, Multiply, Divide Decimals
6.5 The student will
c) solve multistep practical problems involving addition, subtraction, multiplication, and division of decimals.
BIG IDEAS
 I can figure the cost of a meal from a menu, make change after a purchase, and determine how many shelves can be made from a length of board.
 I will
better understand working with money and measurement.
UNDERSTANDING THE STANDARD
· A multistep problem is a problem that requires two or more steps to solve.
· Different strategies can be used to estimate the result of computations and judge the reasonableness of the result.

Example:
What is an approximate answer for 2.19 ¸ 0.8? The answer is around 2 because
2.19 0.8 is about 2 ¸ 1 = 2.
· Understanding the placement of the decimal point is important when determining quotients of decimals. Examining patterns with successive decimals provides meaning, such as dividing the dividend by 6, by 0.6, and by 0.06.
· Solving multistep problems in the context of practical situations enhances interconnectedness and proficiency with estimation strategies.
· Examples of practical situations solved by using estimation strategies include shopping for groceries, buying school supplies, budgeting an allowance, and sharing the cost of a pizza or the prize money from a contest.
ESSENTIALS
 What is the role of
estimation in solving problems? Estimation gives a reasonable solution to a
problem when an exact answer is not required. If an exact answer is required,
estimation allows you to know if the calculated answer is reasonable.
The student will use problem solving, mathematical communication, mathematical reasoning, connections, and representations to
·
6.5c_{1} Solve
multistep practical problems involving addition, subtraction, multiplication
and division with decimals. Divisors are limited to a threedigit number, with
decimal divisors limited to hundredths.
KEY VOCABULARY
approximate, reasonableness, repeating decimals, terminating decimals,
deposit, withdrawal, budget, allowance, decimal, division, quotient, dividend,
divisor, remainder, multiplication, factor, product, addition, sum,
subtraction, difference, tenths, hundredths, thousandths