Factors Factors can be seen as "unmultiplying." In other words, when given a number like 24 we are looking for what numbers multiplied together equal 24. In the case of 24, its factors would be 1, 2, 3, 4, 6, 8, 12, and 24. Factors Game: Factor Feeder
Factors Game: Asteroid Attack Factors Game: Factors Dog Game Practice Problems Multiples A multiple is the result of multiplying one number by another. So some multiples of 3 would be 6, 24, and 99. Multiples Game: Number Ninja Multiples Game: Multiple Frenzy Practice Problems The multiples of any given number are infinite however the factors of a number are limited. Also factors, are smaller than the number given whereas multiples will be larger.
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Counting Up Method Parent Reading When using the counting up method, you create a start and end point on your number line. In the case of 321 - 256, the start point is 256 and the end point is 321. The point of counting up is to see what amount is in between these two numbers (the difference) or in other words, you answer the question: "What number plus 256 equals 321?" ( ________ + 256 = 321) Step 1: Make your start and end point of your number line. You are going to try to find nice numbers to hop to from 256 to 321. Step 2: Find a "nice number" to hop to! What's a nice number after 256? 260! How much did I add to get there? 4 Step 3: What's a nice number after 260? 300! And we added 40 to get there. Step 4: Now on to our destination: 321. To get there from 300, all we have to do is add 21. Step 5: Finally, we add our "hops" or "mountains" that got us from 256 to 321. So 4 + 40 + 21 = 65. So we know 321 - 256 = 65 since 256 + 65 = 321. Counting Backward Method Parent Reading When using the counting backward method, you are starting with the amount you have at the beginning and then taking away in parts to get the difference (your mystery endpoint on the number line). In the case of Step 1: Set up your number line. When it comes to counting backward on a number line, you only have a start point. Your end point will be your answer while the hope should total the amount you are subtracting. ' Step 2: We break up the number we're taking away from 74 in this case, 27. We can first take away 20. Counting back from 74, we are now at 54. Step 3: You need to keep track of how much we are taking away. 27-20=7 We can break up 7 by taking away 4 first. Step 4: Finally we take away the remaining 3 to get our answer: 47.
Below are some other ways to solve this problem by counting backwards Practice Problems Rounding Games (Bike Racing) Rounding Games (Brain Racer) Rounding Games (Soccer Math) Rounding Games (Fly Delivery) When rounding numbers to the nearest ten, hundred, thousand, etc. you look to the digit to the right of the digit you're rounding to see if your rounded digit stays the same or is rounded up. If the digit to the right is 5 or more, the you round up. If it is less than 5, then it's rounded down. For instance if I'm rounding 5,369 to the nearest ten, I would look at the ones place (9) to see if my tens place (6) is rounded up to 7 or stays at 6. Since my ones place is greater than 5, then my tens place is rounded up to 7. Also, all digits following the rounded digit becomes 0.
5,369 Rounded to the nearest..... Ten: 5,370 Hundred: 5,400 Thousand: 5,000 Other Examples You can add and subtract fraction only when the denominators are the same. So we'll begin something easy: adding and subtracting fractions with the same denominator. To do this, all you need to do is add or subtract the numerator. The denominator stays the same. To subtract.... Khan Academy LessonsPractice ProblemsWord ProblemsMore Word ProblemsThe quick refresher is that fractions are parts of a whole. They are made up two numbers the numerator (the top which shows the part) and the denominator (the bottom part which shows the whole)
Online Lesson Practice Problems
Online Lesson Practice Problems
Online Lesson Practice Problems
Online Lesson Post-Lesson Practice (with remainders) Practice Problems (with remainders)
Video Lesson Don't forget:
This method of multiplication is different from the standard or "old school" way of multiplying. Please look at the online lesson as well as the video lesson for further explanation.
Example: 456 x 93 You first need to change both numbers into expanded form. (400 + 50 + 6) x (90 + 3) These numbers will be the headers for each box.
So the size of the box is based off the number of digits you'll be multiplying. A 3-digit number multiplied by a 2-digit number will have a 2x3 box; a 6-digit number multiplied by a 4-digit number will have a 6x4 box.
The Amoeba Multiplication GameOnline Lesson This method of multiplying is pretty different from the "old school" method, so please take a look at the online websites for help. Online Lesson
Practice Problems Recall hearing your teaching say "Okay, round 1,947 to the nearest hundred."? Rounding with decimals is the same as rounding with whole numbers. All you need is a good understanding of place value (tenths, hundredths, thousandths, etc.). Things to Remember:
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