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Grade 3B Info., Updates, News

Wait until you see what we've been up to...

March 16th, 2017

3/16/2017

3 Comments

 

Today in Math, the students and I worked on modelling 2-digit by 2-digit multiplication. There are two ways to do this that we worked on together. The first is using base ten blocks to build an array:

Picture

Just like when we draw arrays, we need to model the factors vertically and horizontally. Since we are trying to figure out what 13 x 21 is (or 13 groups of 21) we first create rows of thirteen and then columns of 21. Then we fill in the array. Finally we can add up the amount of ones, tens, and one hundreds that we have to discover the answer. You can see this step by step by clicking on the gallery below:

You can model an array for any 2-digit by 2-digit multiplication question using base ten blocks:

Picture

Students can also use rectangles and use area to help them to model arrays of 2-digit by 2-digit. Take the example below:

Picture

Start as you would for any array: model the first number (23) for the rows; then model the second number (86) for the columns. Then fill in the rest of the array. Calculate what the value of each rectangle (array) would be. Add them together to find the total amount that has been modelled. You can see this step-by-step by clicking on the gallery below: 

Modelling is one way that we encourage students to gain a better understanding of 2-digit by 2-digit multiplication. In fact, when you compare it to other methods of multiplying, you can see clearly that modelling a number can help to give students a better understanding of where we get the numbers when we multiply. 

Picture

Agenda
Language Arts:
- Read 20 minutes
- Book Orders (due March 24th)

Math:
- Practice 6x, 12x, 5x, 10x, 7x, or 11x tables

Health:
- PEAK Basketball (Wednesday) 
- FRIENDS: pg. 120 (Wednesday)

Science:
- Family Science Night (March 21st, 5:30-6:30 pm)

Tech & Trades Academy - Mondays (3:00-4:00 pm)
Grade 5/6 Guitar Club - Thursdays (2:45-3:45 pm)
CG Recyclers - Day 1 (lunch recess) and Day 4 (lunch)
​Ski Day - March 20th
Art Studio Field Trip - March 23rd (return permission forms and $5 ASAP)

3 Comments
DHRUVI
3/16/2017 06:39:13 pm

Hi Ms.B, I was wondering about math when you said we didn't know about 3 digit by 2 digit did you say we hanged both numbers?

Reply
Ms. Barrington link
3/18/2017 08:32:15 am

When you are estimating, yes, this is one way that you can estimate the answer to a 3-digit by 2-digit multiplication question. For example,

Estimate
312 x 24 =
300 x 20 = 6000

The real answer is 7488, so the above is not always the most accurate method, but it is an okay method to use when you are just learning how to multiple.

Reply
Dhruvi
3/18/2017 10:18:31 am

Ok thanks Ms.B I have been practising it like that and I notice it isn't the most accurate but it still helps.Thanks!😊

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  • About
  • Newsletter
  • Seesaw Blog
  • GR 3
    • Grade 3 At-a-Glance
    • Language Arts >
      • Reading
      • Writing
      • Word Work
    • Math >
      • Statistics and Graphing
      • Patterns
      • Whole Numbers
      • Addition And Subtraction
      • Measurement
      • Fractions
      • Geometry
      • Multiplication and Division
    • Science >
      • Rocks and Minerals
      • Building and Materials
      • Hearing and Sound
      • Animal Life Cycles
      • Science Fair
    • Social Studies >
      • Mapping
      • Communities in the World
      • Global Citizenship
    • Health
    • Leader in Me
    • Art
    • Video Yearbook
  • Links
    • FMPSD Website
    • Christina Gordon Website
    • Art for Kids Hub
    • Code.org
    • Dance Mat Typing
    • DOGO News
    • Epic!
    • EverFi
    • Exambank
    • FlipGrid
    • GoNoodle
    • Kahoot!
    • LearnAlberta
    • Math Makes Sense
    • Math 5 Live
    • Mathletics
    • PBS Kids: Math Games
    • Spelling City
    • TumbleBooks
    • Tynker
    • Wonderopolis
  • Contact