# One-to-one Correspondence

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#### Storyboard Text

• Students today your homework will be over "one-to-one correspondence".﻿
• What is that?﻿
• Do you know what one to one correspondence is, Sophia?﻿
• No, we haven't started learning that yet.﻿
• ﻿
• I will once I put your brother to sleep.﻿
• It's over one-to-one correspondence.﻿
• Will you help me with my homework, Mom?﻿
• What is one-to-one correspondence?﻿
• So this means for each element of Y there is exactly one element of X﻿, then the two sets X and Y are in one-to-one correspondence.
• One-to-one correspondence is when ﻿sets X and Y can be paired together so that each element of X there is exactly one element of Y.
• Here is an example for you, ﻿there are three of your classmates, Alice, Bennett, and Carol, and there are four desks in the classroom left. Is this a one-to-one correspondence?
• ﻿
• ﻿Alice Bennett Carol
• ﻿
• ﻿Desk 1 Desk 2 Desk 3 Desk 4
• ﻿No, because there is one desk left over.
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