September - Number Sense and Numeration

                                            

Ce qu'on fait en mathématiques...

                                                                    September 2016

Bonjour!

Our current focus in math has been on numbers (as part of our number sense unit). We have been concentrating on representing, ordering and counting numbers using different tools and manipulatives. Your child will build on their knowledge from previous years and he/she will be working with numbers from 0 to 1000. Your child will be counting forwards to 1000 by 1, 2, 5, 10, 25 and 100 and backwards from 100 by 1, 2, 5 and 10.  They will also be estimating, rounding, representing and decomposing numbers according to their place value (i.e., 423 = 4 hundreds 2 tens and 3 ones).  They will have many opportunities to use their knowledge in a variety of ways, and we will use appropriate math vocabulary to describe what we discover.   

During this unit we will be learning the following overall expectation:

·         read, represent, compare, and order whole numbers to 1000

·         demonstrate an understanding of magnitude by counting forward and backwards by various numbers and from various starting points

Le vocabulaire!

Here is a list of important words that we will be using during our unit on number sense.  Please encourage your child to use these words when communicating his/her knowledge of numbers with you.

droite numérique – number line                   quantité – quantity (amount)

le plus -  the most                                      le moins -  the least

plus grand que -  bigger than                      plus petit que – smaller than

grille de cent – 100’s chart           colonnes, - columns

rangées - rows                             les nombres – numbers        les chiffres - digits

les suites - patterns                   arrondir - round                  efficace – efficient

compter par bonds/compter par intervalles – skip counting forwards

compter à rebours – skip counting backwards

les nombres ordinaux – ordinal numbers (1st, 2^nd etc.)

What activities could you do at home to support your child?

ü  Go on a search for numbers wherever you are.  You can look at houses, signs, cars, windows, etc.  Have your child represent various forms of these numbers (number, words, pictures, place value)

ü  Practice counting forwards and backwards by 1, 2, 5 and 10 on the 100s chart.  Discuss with your child patterns they notice on the chart (i.e., each row increases by 10 and each column increases by 1).

ü  Have your child fill in the blank number lines provided and then practice counting forwards and backwards by 2, 5 and 10.  Keep in mind that number lines do not always have to start at 1.  They could start from various points (ex. 20, 21, 22 …)

ü  While you’re making dinner ask your child to count the number of beans or how many forks are in the drawer.  They can practice by counting by jumps of 2, 5 of 10.  Ask them if there is a more efficient way of counting and why.

ü  Have your child order numbers or tell you which is bigger and which is smaller.

Have fun with math!

The Grade 3 Teachers