Third Grade

Welcome to 3rd Grade math!!

Highlights from this year include:

• Reading, writing, visualizing, comparing, ordering, and rounding three-digit numbers
• Reviewing multiplication concepts and the array model of multiplication
• Investigating and reinforcing the multiplication facts for tens and fives
• Working with liquid volume (gallons, and parts of a liter)

 

Numbers in Base-10

Students briefly review place value and two-digit numbers. Then they extend
their understanding with a focus on reading, writing, visualizing, and comparing
three-digit numbers.

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For home:

• Look for examples of three-digit numbers in their world and ask your child
to read them aloud — e.g. bowling scores, house numbers, grams on grocery
items, weights of their favorite sports players.

• Say three-digit numbers to your child and have them write them down. Be sure to
include numbers with zero in the tens place, such as 507 and 904.

• Have your child say which three-digit number is the greatest or least. Remember
to ask how they know.

Tens and hundreds are important benchmarks in our number system because knowing
where other numbers are in relation to tens and hundreds helps with estimation.

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This is called a numeral
expander. Your child will fold
and write on one in class.

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Numeral expanders help students read and write numbers because they can
see the value of each place when it is unfolded.

Multiplication

Multiplication is a major focus in Grade 3. One way to think about multiplication
is by visualizing a collection of equal-sized groups.

Another way to think about multiplication is by arranging objects in an array
(rows and columns). For example, 3 rows with 4 in each row can illustrate 3 × 4.

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Recognizing the commutative property for multiplication (3 × 4 = 4 × 3)
makes some computations easier to do.

screen-shot-2016-11-09-at-3-36-31-pmFor home:

• Look for groups of five and ten in your home, at the store, and the area you live in.

• Ask your child to solve real-world problems such as, “There are 4 people  in our family. Each person eats 5 apples a week. How many apples do we need to buy at the grocery store?” Remember to ask how they know.

 

 

 

This is an equation. An equation must include the equals symbol (=). factors product 4 × 5 = 20.
The commutative property allows the order of the factors to be changed without
changing the product. 4 × 5 = 5 × 4.

 

Measurement

At the end of Grade 2, students were introduced to cups, pints, quarts, and liters.
In Grade 3, students are introduced to the gallon.

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1 gallon = 4 quarts
1 liter is a little more than 1 quart.

 

 

 

 

For home:

• When your child helps you with shopping, and in the kitchen, talk about the sizes
of containers for beverages, cereals, dairy products, ice cream, and so on.

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