IM: 6.5.5: Decimal Points in Products (Lesson) - Formative Staff | Biblioteka

1

In which equation is the value of x the largest?

x \cdot 10=810

x \cdot 10=81

x \cdot 10=8.1

x \cdot 10=0.81

1

How many times the size of 0.81 is 810?

Work with a partner. One person solves the problems labeled “Partner A” and the other person solves those labeled “Partner B.” Then compare your results.

1

Use your work in the previous problems to find 720 \cdot (0.1) and 720 \cdot (0.01). Explain your reasoning.

Pause here for a class discussion.

1

Jada says: “If you multiply a number by 0.001, the decimal point of the number moves three places to the left.” Do you agree with her? Explain your reasoning.

1

Select all expressions that are equivalent to (0.6) \cdot (0.5). Be prepared to explain your reasoning.

6 \cdot (0.1) \cdot 5 \cdot (0.1)

6 \cdot (0.01) \cdot 5 \cdot (0.1)

6 \cdot 1/10 \cdot 5 \cdot 1/10

6 \cdot 1/1,000 \cdot 5 \cdot 1/100

6 \cdot (0.001) \cdot 5 \cdot (0.01)

6 \cdot 5 \cdot 1/10 \cdot 1/10

6/10 \cdot 5/10

1

Find the value of (0.6) \cdot (0.5). Show your reasoning.

Are you ready for more?

1

Ancient Romans used the letter I for 1, V for 5, X for 10, L for 50, C for 100, D for 500, and M for 1,000. Write a problem involving merchants at an agora, an open-air market, that uses multiplication of numbers written with Roman numerals.