Test Answers and Homework.

Today's Test.

Number of the test is : 8497.365


1. Half of the number of the test is: 4248.6825

2. Write the number of the test in expanded form: 8000 + 400 + 90 + 7 + 0.3 + 0.06 + 0.005

3. Write the number of the test in written form: Eight thousand, four hundred ninety-seven and three hundred, sixty-five thousandths.

4. Round the number to the nearest 100: 8500

5. What Digit is in the tenths place: 3

6. The number of the test doubled is: 16994.73

7. 123.45 more than the number is: 8620.815

8. 987.65 less than the number is: 7509.715

9. (You do not have to answer this)

10. Cube, the digit in the ones place: 7 x 7 x 7 = 49 x 7 = 343 (No, not 7x3.)

11. Square, the digit in the hundreds place: 4 x 4 = 16

12. Divide the number by 3.55 and round to the nearest hundreths: 2393.62

13. The product of all digits in the number of the test is: 181440


*Please comment and tell me what I did wrong if there are mistakes. I will edit it to make sure it's right.


Todays Homework:

Pg. 71-73 #4-24 .. First do even, after do odd numbers. (ex: first do answers 4, 6, 8, etc. then do 5, 7, 9, etc.)



Reminders:

Also, PLEASE study for the test next week. Sorry to tell you guys but .. WE 7-43 HAVE 2 tests next week, one on Tuesday and one on Thursday.

Number Of The Day

Today's number of the day is: 2691.348

1. Half of the number of the day is: 1345.674

2. Write the number of the day in expanded form: 2000 + 600 + 90 + 1 + 0.3 + 0.04 + 0.008

3. Write the number of the day in written form: Two thousand, six hundred, ninety one and three hundred, forty-eight thousandths.

4. Round the number of the day to the nearest 100: 2700

5. What is the digit in the tenths place: 3

6. The number of the day doubled is: 5382.696

7. 123.45 more than the number is: 2814.798

8. 987.65 less than the number is: 1703.698

(You don't need to do number 9)

10. Cube the digit in the ones place: 1 x 1 x 1 = 1

11. Square the digit in the hundreds place: 6 x 6 = 36

12. Divide the number by 3.55 and round to the nearest hundredth: 758.13

13. Product of all the digits in the number of the day is: 2 x 6 x 9 x 1 x 3 x 4 x 8 = 10368

* If I did any wrong, please tell me what I did wrong and how to do it properly (:

*Pages 71 - 73, # 4 - 24 ( Even numbers only) in textbook work was assigned to us although it is not homework. Next class we will continue where you guys left off.

*For people who didn't make up a math equation that equals to 6 for letter G (yesterday's homework).. make sure that you do one to get marks!

*Tomorrow's test will be on number of the day! So make sure you know how to do them properly. If you have any questions just comment.

Multiplying Decimals

This is a blog of today's math notes.

How do you multiply by decimals? First we will look at dividing by .5

Multiplying by decimals is the same thing as dividing by whole numbers. But how is that possible?

If you multiply something by less than 1 you're going to get a smaller number than the number you are dividing by. 2x.5= 1. Its the same as 2 divided by 2.

eg. 46x2.5

Let's break it down.

40x2=80 6x2=12

80+12=92

Now we have the decimal part.

When you see x.5 it means to divide by 2

So 40 multiplied by .5 really means 40 divided by 2

40 divided by 2 equals 20

6 divided by two equals 3

20+3=23

92+23=115

So 46x2.5= 115

Here's a video that might help.

One thing the video brought up is that even though it looks like the answer is 3,864 you have to consider the numbers after the decimal point that hold value. In the equation the digits .1 and .4 are after the decimal point so you move the decimal point two places to the left. You will get 38.64 instead of 3,864.

I'm sorry about the fact that my keyboard doesnt have a divide button on it.

Remember: Math Links page 57-59 numbers 3-21 isn't homework

Here's an excellent link to a website that explains the concept of multiplying decimals well.

http://www.mathsisfun.com/multiplying-decimals.html