Presentation on theme: "or “Half of one, Six twelfths of the other”"— Presentation transcript:
1or “Half of one, Six twelfths of the other” Equivalent Fractionsor“Half of one,Six twelfths of the other”
2What is a fraction?A fraction is part of a whole that is made up of equal parts.
3Part of a whole what? And here’s the person who ate it. Well, it could be part of a whole object, like the proverbial pizza . . .Here is a whole pizza.And here is 1/8 of the pizza.18Here is 7/8 of the pizza because there are 7 out of 8 slices left.78
4Was there something else? Yes, it could also be part of a whole group of items.Here is a group of cookies.We could say 1/5 of these cookies are chocolate chip. We could also say that 4/5 are Oreos.154534Oops, let’s make that 3/4 are Oreos.
5So, what are equivalent fractions? Well, sometimes an object or a group of items can be divided differently, and fractions can name the same amount.
6Say, what?Okay, try this. Let’s take a rectangle and divide it into 8 parts.Now, if we color 2 parts, we say that 2/8 of the rectangle are shaded.28
7I’m with you. What’s next? Now, let’s take that same rectangle and divide it into 16 parts.If we color 4 parts, we say that 4/1 of the rectangle are shaded.416
8So that means? So that means 2/8 is equivalent to 4/1 . 16And we write it this way:=28416
9Give us another example. Okay, how about:39133913=
10How do you find equivalent fractions? You can multiply (or divide), but you must multiply (or divide) both the numerator AND denominator by the same number.14312x3=x325410x2=x2
11What about dividing?Here’s how.42015÷ 4=÷ 441427÷ 2=÷2
12What if you’re not sure?Here is how you can check to see if two fractions are equivalent.You can “cross-multiply.”5 x 2 = 1015210=1 x 10 = 10Since both products are the same, these two fractions are equivalent.
13How do you know if they’re not equivalent? Here is an example. You still “cross-multiply.”3 x 4 = 122345=2 x 5 = 10Since both products are NOT the same, these two fractions are NOT equivalent.
14Now what? Let’s do some practice activities in the computer lab. Here’s an activity we will do.
22Go to VIEW and add a header for your name. Save on the N DRIVE Go to VIEW and add a header for your name. Save on the N DRIVE. Save every few minutes.
23Highlight all the cells you need to shade for the first fraction on the first table. 1248=
24Right click on the highlighted cells and choose BORDERS AND SHADING…
25Make sure it says APPLY TO: CELL. Then choose a color. Click OK.
26Then, shade the second fraction on the second table. 1248=
27Continue until you have completed all the examples Continue until you have completed all the examples. On some you will need to complete one or more of the fractions. Just click where the number goes, and type.134=
28On the last one, you need to create your own tables On the last one, you need to create your own tables. Go to TABLE on the menu bar. Drag down to INSERT. Drag across to TABLE.
29Choose the number of columns and rows you will need.
30Save and print when you are done. Are there any questions?I’ll give you the written directions in the lab.Let’s go!