# Khan/khan-exercises

Add exercise -- simpler equivalent fractions that approaches problem …

`…visually`
1 parent a088aa0 commit ca5924d1d017b0bd35abaee2d1a56e92a616d3c6 marcia committed Jun 13, 2011
Showing with 81 additions and 3 deletions.
1. +80 −0 exercises/equivalent_fractions_1.html
2. +1 −3 utils/word-problems.js
80 exercises/equivalent_fractions_1.html
 @@ -0,0 +1,80 @@ + + + + Equivalent Fractions 1 + + + +
+
+ randRange( 1, 3 ) + randRange( 2, 4 ) + randRange(2, 3) + A * M + B * M +
+ +
+
+
+

\dfrac{A}{B} = \dfrac{?}{D}

+
+
C
+
+
+

The fraction on the left represents A out of B slices of a rectangular pizza( 1 ).

+
+ rectchart( [A, B - A], ["#ee0000", "#999"] ); +
+
+
+

What if we cut the pizza( 1 ) into D slices instead? How many slices would result in the same amount of pizza( 1 )?

+
+ rectchart( [D], ["#999"] ); +
+
+
+

We would need C slices.

+
+ rectchart( [C, D - C], ["#ee0000", "#999"] ); +
+
+

\dfrac{A}{B} = \dfrac{C}{D} and so the answer is C.

+ +
+
+ +
+
+

\dfrac{A}{B} = \dfrac{C}{?}

+
+
D
+
+
+

The fraction on the left represents A out of B slices of a rectangular pizza( 1 ).

+
+ rectchart( [A, B - A], ["#ee0000", "#999"] ); +
+
+ +
+

How many total slices would we need if want the same amount of pizza( 1 ) in C slices?

+
+ rectchart( [C, D - C], ["#ee0000", "#fff"] ); +
+
+ +
+

We would need to cut the pizza( 1 ) into D slices.

+
+ rectchart( [C, D - C], ["#ee0000", "#999"] ); +
+
+ +

\dfrac{A}{B} = \dfrac{C}{D} and so the answer is D.

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+
+
+
+ +
4 utils/word-problems.js
 @@ -218,9 +218,7 @@ jQuery.fn[ "word-problemsLoad" ] = function() { var pizzas = KhanUtil.shuffle([ "pizza", "pie", - "cake", - "orange", - "lemon" + "cake" ]); jQuery.extend( KhanUtil, {