14.1: Number Talk: Multiplication with Decimals
Find the products mentally.
$6\boldcdot (0.8)\boldcdot 2$
$(4.5)\boldcdot (0.6)\boldcdot 4$
Let’s solve more percentage problems.
Find the products mentally.
$6\boldcdot (0.8)\boldcdot 2$
$(4.5)\boldcdot (0.6)\boldcdot 4$
Your teacher will give you either a problem card or a data card. Do not show or read your card to your partner.
If your teacher gives you the problem card:
Read your card silently and think about what you need to know to be able to answer the questions.
Ask your partner for the specific information that you need.
Explain how you are using the information to solve the problem.
Solve the problem and show your reasoning to your partner.
If your teacher gives you the data card:
Read your card silently.
Ask your partner “What specific information do you need?” and wait for them to ask for information.
If your partner asks you for information that is not on the card, do not do the calculations for them. Tell them you don't have that information.
Have them explain “Why do you need that information?” before telling them the information.
After your partner solves the problem, ask them to explain their reasoning, even if you understand what they have done.
A pot can hold 36 liters of water. What percentage of the pot is filled when it contains 9 liters of water?
Here are two different ways to solve this problem:
Using a double number line:
We can divide the distance between 0 and 36 into four equal intervals, so 9 is $\frac14$ of 36, or 9 is 25% of 36.