Video: Understanding Two Halves Make a Whole

Here is half of a circle. Which piece do you need to make a whole circle?

02:05

Video Transcript

Here is half of a circle. Which piece do you need to make a whole circle?

We’re shown half of a circle. This half is shaded pink. We have to find the piece which we need to make a whole circle. We’re shown three different circles and each circle has a different piece shaded pink. Which one can we match with the first circle to make a whole circle? If we add the first half of a circle to this circle, it doesn’t make a whole circle. We know we can’t add this piece to our half to make a whole circle. This circle only has a quarter shaded. A half and a quarter don’t make one whole.

Does this second circle fit with our half a circle to make a whole? Yes, it does. Two halves make one whole. This is the piece which we need to make a whole circle. Two halves make a whole. This piece doesn’t make a whole circle. We might be tricked into thinking that this is a half of a circle. But half of a circle is when we divide a circle into two equal parts. The parts in this piece are not equal. So this cycle doesn’t show a half. The piece we need to make a whole circle is the one shown in the middle because two halves make a whole.

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