Welcome to Third grade's Math Website!We are currently working on measuring capacity, weight, volume and time. During this chapter students will choose units to measure weight and mass, capacity, use models to measure volume and tell time.
Vocabulary:Divide: To seperate into eqaul groups. Can also be thought of as repeated subtraction.
Dividend: A number that is being divided. 21 ÷ 3 = 7 Division: An operation that seperates a number into equal groups. Divisor: The number by which the dividend is being divided. 21 ÷ 3 = 7 Fact family: A group of related facts using the same numbers: 5 x 3 = 15 3 x 5 = 15 15 ÷ 3 = 5 15 ÷ 5 = 3 Quotirnt : The Answer to a division problem. 21 ÷ 3 = 7 |
Use the links below and the game tab to find useful math webpages enriching skills learned in the classroom, practice or just for fun! You can Find homework assignments, tips and tricks, or ask questions on my blog or contact me directly through the contact tab.
HomeworkHomework for December 5 - 9:
Useful materials: |
Homework Tips and Tricks:
2/20
We are starting our division chapters. We are stressing in class the relationship between multiplication and division. All the hard work the students put into memoriziong there multiplication facts is paying off!
Multiplication is the opposite of division and can be used to solve problems. We call these related facts, for example:
Solve: 21 ÷ 3 =
We can use our related multilication fact of 3 x 7 = 21, so 21 ÷ 3 must equal 7.
Another way of looking at division is using repeated subtraction. We will look at the same example as above. We would like to know how many equal groups of three are in 21, so we begin to subtract by 3 and keep track how many groups we subtract.
21 - 3 = 18 ; 18 - 3 = 15 ; 15 - 3 = 12 ; 12 - 3 = 9 ; 9 - 3 = 6 ; 6 - 3 = 3 ; and 3 - 3 = 0
1 2 3 4 5 6 7
We subtracted 7 equal groups of 3, ao again our answer is 7.
1/31
This chapter tends to be very "hands on" and applicable to everyday life. We encourage you to help your students by creating problems "on the fly". You could find capacities around the house like gallons, pints, cups, fluid ounces (pop cans, Gatorade) to give them real life experiences where capacities are used. This will also enforce their knowledge to make predictions and estimations in the classroom. Use the U.S. Capacity conversions chart found above to help with homework. Also, the following metric conversions will help:
Capacity:
1,000 milliliters = 1 liter
Mass:
1,000 grams = 1 kilogram
12/1
Practice your multiplication flashcards. Remember strategies leaned in class, starting with what you know and splitting problems into easier problems.
Examples:
Solve 7 x 8.
We know that 7 x 5 = 35. But we need to solve 7 x 8, so we need to add 3 more 7s, or 21. 35 + 21 = 56, so 7 x 8 = 56.
We can also make 7 x 8 into 2 easier multiplication sentences.
7 x 8 = 7 x 4 + 7 x 4
28 + 28 = 56
There are many different ways to solving multiplication problems. You have to find the way that works best for you!
11/8 - 11/11
When subtracting multi digit numbers be sure place values are always lined up. Once you have set up your problems work carefully to not forget about your regrouped numbers.
For problem solving remember when choosing a strategy look for key words like about for estimation, and for reasonable answers, is the solution something you would expect? Is it close to your math? Also, for reasonable numbers look at last weeks notes.
10/31 - 11/4When asked to solve using rounding it is best to practice using the "Rounding Poem" (see link above) used in class. Estimation is supposed to be quick. Feel free to round to the nearest 10 or even 100 before solving. We say the more zeros the "friendlier" the numbers are to add.
Solving using compatible numbers is very similar, but is different because the student is choosing numbers that are easy to add for them. For example: 27 + 18 = ? Using compatible numbers we can change 27 to 25 and 18 to 20, creating the compatible addition sentence, 25 + 20 =. The original addition sentence equals 45, and our compatible addition sentence solution is also 45. This may be a unique example, however we see that using compatible numbers is going to get us closer to the actual sum from the first addition sentence.
If compatible numbers is still very confusing for you and your student, the next best option is to round to the nearest 10 and solve.
We are starting our division chapters. We are stressing in class the relationship between multiplication and division. All the hard work the students put into memoriziong there multiplication facts is paying off!
Multiplication is the opposite of division and can be used to solve problems. We call these related facts, for example:
Solve: 21 ÷ 3 =
We can use our related multilication fact of 3 x 7 = 21, so 21 ÷ 3 must equal 7.
Another way of looking at division is using repeated subtraction. We will look at the same example as above. We would like to know how many equal groups of three are in 21, so we begin to subtract by 3 and keep track how many groups we subtract.
21 - 3 = 18 ; 18 - 3 = 15 ; 15 - 3 = 12 ; 12 - 3 = 9 ; 9 - 3 = 6 ; 6 - 3 = 3 ; and 3 - 3 = 0
1 2 3 4 5 6 7
We subtracted 7 equal groups of 3, ao again our answer is 7.
1/31
This chapter tends to be very "hands on" and applicable to everyday life. We encourage you to help your students by creating problems "on the fly". You could find capacities around the house like gallons, pints, cups, fluid ounces (pop cans, Gatorade) to give them real life experiences where capacities are used. This will also enforce their knowledge to make predictions and estimations in the classroom. Use the U.S. Capacity conversions chart found above to help with homework. Also, the following metric conversions will help:
Capacity:
1,000 milliliters = 1 liter
Mass:
1,000 grams = 1 kilogram
12/1
Practice your multiplication flashcards. Remember strategies leaned in class, starting with what you know and splitting problems into easier problems.
Examples:
Solve 7 x 8.
We know that 7 x 5 = 35. But we need to solve 7 x 8, so we need to add 3 more 7s, or 21. 35 + 21 = 56, so 7 x 8 = 56.
We can also make 7 x 8 into 2 easier multiplication sentences.
7 x 8 = 7 x 4 + 7 x 4
28 + 28 = 56
There are many different ways to solving multiplication problems. You have to find the way that works best for you!
11/8 - 11/11
When subtracting multi digit numbers be sure place values are always lined up. Once you have set up your problems work carefully to not forget about your regrouped numbers.
For problem solving remember when choosing a strategy look for key words like about for estimation, and for reasonable answers, is the solution something you would expect? Is it close to your math? Also, for reasonable numbers look at last weeks notes.
10/31 - 11/4When asked to solve using rounding it is best to practice using the "Rounding Poem" (see link above) used in class. Estimation is supposed to be quick. Feel free to round to the nearest 10 or even 100 before solving. We say the more zeros the "friendlier" the numbers are to add.
Solving using compatible numbers is very similar, but is different because the student is choosing numbers that are easy to add for them. For example: 27 + 18 = ? Using compatible numbers we can change 27 to 25 and 18 to 20, creating the compatible addition sentence, 25 + 20 =. The original addition sentence equals 45, and our compatible addition sentence solution is also 45. This may be a unique example, however we see that using compatible numbers is going to get us closer to the actual sum from the first addition sentence.
If compatible numbers is still very confusing for you and your student, the next best option is to round to the nearest 10 and solve.
Useful links to Webpages:
Connected Math Website: Really good online math tutorials presented and connected directly with our math textbooks. Select grade level and find online games, multimedia presentations and math tool chest to help with concepts.
Multiplication Baseball
Practice your multiplication facts while playing a game of baseball!
Test out your multiplication, division skills or just practice.
Self correcting, timed multiplication/division tests:
Rounding Practice:
Rounding
Multiplication Baseball
Practice your multiplication facts while playing a game of baseball!
Test out your multiplication, division skills or just practice.
Self correcting, timed multiplication/division tests:
Rounding Practice:
Rounding