You Survived!

PHEW!

Grade 5s, your test is OVER!  Give yourselves a big pat on the back for the hard preparation work you did to get ready for our test.

I am so proud of how far you have come in this unit.  When we began whole numbers, most of you didn't know how to multiply with two-digit numbers or how to do long division.  Even though it was a challenge, you stuck with it.

Way to go!

I hope you have a great day tomorrow, and remember to be safe this weekend.

See you Monday!

-Ms. Lewis.

Whole Numbers Test

Happy Monday, Grade 5s!

 

Your Whole Numbers test will be this Thursday, October 29th. Today in class I gave you a study guide. Here's what it said:

 

 Make sure you know how to:

• write numbers in standard form and expanded form (e.g., 860 437 is standard form, 800 000+60 000+400+30+7 is expanded form)
• write the value of an underlined digit (e.g., 860 437=60 000)
• write a series of numbers in order from greatest to least/least to greatest
• find the sum of a 3-number, 4-digit addition problem (e.g., 4527+6589+4582)
• find the difference of a 4-digit subtraction problem (e.g., 7412-4386)
• write the related facts for sets of numbers (e.g., 8, 12, 96 = 8x12=96, 12x8=96, 96÷ 8=12, 96÷ 12=8)
• find the product or quotient of multiplication and division problems, including multiples of 10 (e.g., 50x90=4500, because 5x9=45 plus two zeroes)
• multiply using two-digit numbers
• divide using long division

 

If you're not sure about any of these things, post your questions here, or ask Ms. Lewis in class before Thursday.

See you tomorrow!

 

-Ms. Lewis.

 

Long Division

Happy Wednesday!

We've been practising our long division skills for the past few days.  I can tell that each day, you're starting to get it a little bit more and more.  That's great!

Remember the steps:

1. Divide
2. Multiply
3. Subtract
4. Bring down
5. Repeat steps 1-4.

Here's a website with a detailed explination:
http://argyll.epsb.ca/jreed/extras/longdiv/

Questions with tonight's homework?  Post them here!

-Ms. Lewis.

Super Multiplication Challenge!

Hi Grade 5s, and happy Friday!

As promised, here is your SUPER MULTIPLICATION CHALLENGE!!!!!!

65983 x 47324

We are still waiting for the right answer on this one.  First one to post it ON THE BLOG wins a prize.

Who will it be? 

Multiplying with Multiples of 10

TGIF, Grade 5s!

Today in class we looked at patterns formed when multiplying multiples of 10.  We know a number is a multiple of 10 when it ends with a 0.

We started the lesson by finding the products for the following questions:
25 x 10 = ?
25 x 100 = ?
25 x 1000 = ?

Then we used the knowledge we got from the pattern to figure out what 25 x 100,000 would be.

We figured out that the pattern was to add as many zeroes as we see in the problem.  For example, 25 x 10 contains 1 zero, so the answer is 250.  25 x 100 has 2 zeroes, so the answer is 2 500.  25 x 1000 has 3 zeroes, so the answer is 25 000, etc.

We realised we could do the same thing with basic facts and place-value patterns:

7 x 8 = 56
7 x 80 = 560
7 x 800 = 5600
7 x 8000 = 56 000

I hope you have a great Thanksgiving weekend with your families.  Remember: Tuesday is Picture Day.  Better start planning those outfits now!  Maybe something like this?

See you Tuesday!

-Ms. Lewis.

Multiplication and Division Facts to 144

Happy Thursday!

Today in class we reviewed the idea of related facts.  We knew that if 8 x 9=72, then 9 x 8=72, as well.  Based on that, we also know that 72 ÷ 9=8, so 72 ÷ 8 must equal 9.

We say the related facts for 72, 9, and 8 are:

9 x 8 = 72
8 x 9 = 72
72 ÷ 9 = 8
72 ÷ 8 = 9

We also discussed that knowing some multiplication facts can help us figure out ones we don't.  For example, knowing that 11 x 9 = 99 helps us figure out 12 x 9.  We know that if we're multiplying by 12, we can simply add another 9 to the product of 11 x 9 (11 x 9 = 99 + 9 = 108). 

So...12 x 9 = 108.

Questions?  Post them here.

-Ms. Lewis.

Subtracting 4-Digit Numbers

Hi Grade 5s!

Our lesson today began with the question about Emma's pedometer.  We knew that she recorded how many steps she took in 2 hours.  We also knew that she took 1347 steps in the first hour, and 984 steps in the second hour.  We had to figure out how many more steps she took in the first hour than in the first.

We decided that we were looking for the difference, and we learned that the word difference means we need to be subtracting.

So we did: 1347-984.

We started in the ones column, subtracting 4 from 7 to get 3.

Then we subtracted the tens column.  We knew we couldn't do 4-8, so we borrowed from the hundreds column to make the 4 into 14.  Then we did 14-8=6.

Next, we subtracted the hundreds column.  Because we had borrowed from the hundreds column for the tens column, we needed to do 2-9.  We knew we couldn't do that, though, so we borrowed from the thousands column to make it 12-9, giving us 3. 

We had nothing left in the thousands column.

Our answer was 363.  Micah and Lisa wrote:

 Emma took more steps in the first hour. 

Emma took 363 more steps.

We also checked our answer with a calculator to make sure that it was correct. 

So 1347-984=363.

Great job, ladies!

Questions?  Post them here, or ask me tomorrow in class.

-Ms. Lewis.

Adding and Subtracting Big Numbers

Happy Tuesday, Grade 5s!

Today in class, we talked about strategies for doing "mental math" with big numbers.  We spent most of our time talking about rounding numbers to the nearest hundred, and then adding or subtracting them.

For example:

If I needed to subtract 5793 from 8452 (8452-5793), I could round both numbers to the nearest hundred. 

Let's start with 8452.  To round to the nearest hundred, I'm going to look at the digit in the TENS column.  If that digit is 5 or greater, I will round UP.  If the digit in the tens column is less than 5, I will round DOWN. 

The digit is 5, so we will round up to 8500.

Now let's look at 5793.  I need to look at the number in the tens column, which is a 9.  I know I need to round UP to 5800.

Now I can subtract: 8500-5800=2700.


Super Challenge:

Try this to challenge yourself:

75426341+42568772

The first person to post the answer on the blog wins a prize tomorrow in class!

Good luck!

Remember, if you have any questions about tonight's homework, or today's lesson, post them here and I'll write you back.

See you tomorrow!

-Ms. Lewis.