Cut pizzas into equal slices and shade the parts. Compare, match, add and beat the clock.
Start here. A fraction is part of a whole. Cut a pizza into equal slices. The bottom number says how many equal slices the whole pizza has. The top number says how many slices you are talking about. So 3 out of 4 slices is three quarters.
Equal is the key word. Fractions only work when every slice is the same size. Two halves make a whole pizza. Four quarters make a whole pizza too.
Bigger bottom number, smaller slices. A pizza cut into 8 slices has smaller slices than one cut into 4. So one eighth is smaller than one quarter. When the pizzas are the same size, you can compare fractions by looking at how much is shaded.
Same amount, different slices. One half and two quarters cover exactly the same part of the pizza. We call them equivalent fractions. Cut each slice in two and you double both numbers.
Adding with the same bottom number. One quarter plus two quarters is three quarters. The slices are the same size, so you only add the top numbers and keep the bottom number.
Try this above. In Play, cut a pizza into 4 slices and shade 2. Now change to 2 slices and shade the same amount. Turn on Compare and put 1/3 next to 1/4. Which slice is bigger?
A fraction names a part of a whole that was cut into equal pieces. In 3/4, the 4 is the number of equal pieces and the 3 is how many pieces you have.
With 3 slices each slice is bigger than when you cut the same pizza into 4. Fewer slices means each slice is larger.
Pick the level, not the age. "Just starting" uses halves, thirds and quarters. "I know the basics" goes up to eighths with comparing and equivalent fractions. "Challenge me" adds tenths and twelfths, taking away, and counting more than one whole.
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