How to Subtract By Adding

"Some infinities are bigger than other infinities" - Hazel Grace Lancaster, in "The Fault in Our Stars," by John Green

Your antivirus squad is up against a code that's hijacked your mainframe. What you've learned from other infected systems, right before they went dark, is that it likes to toy with antivirus agents in a very peculiar way— and you're the...

In a lively show, mathemagician Arthur Benjamin races a team of calculators to figure out 3-digit squares, solves another massive mental equation and guesses a few birthdays. How does he do it? He’ll tell you.

Today we know that humans and chimpanzees share 99% of their DNA and that we have a lot in common. Not just how we look, but how we behave, form groups, defend our turf, and love each other. People didn't always see other...

How to Subtract By Adding

As Numberland's best detective, you thought you'd seen it all. But the desiccated corpses of prominent natural numbers have been showing up all over the city. A lockdown is ordered from sundown to sunrise, and it's still not enough to...

Consider the claw. Frequently found on animals around the world, it's one of nature's most versatile tools. Bears use claws for digging as well as defense. An eagle's needle-like talons can pierce the skulls of their prey. Even the...

1, 11, 21, 1211, 111221. These are the first five elements of a number sequence. Can you figure out what comes next? Alex Gendler reveals the answer and explains how beyond just being a neat puzzle, this type of sequence has practical...

Can you produce a rational number by exchanging infinitely many digits of pi and e?

"Some infinities are bigger than other infinities" - Hazel Grace Lancaster, in "The Fault in Our Stars," by John Green

You've found Leonardo da Vinci's secret vault, secured by a series of combination locks. Fortunately, your treasure map has three codes: 1210, 3211000, and. . . hmm. The last one appears to be missing. Can you figure out the last number...

Imagine trying to use words to describe every scene in a film, every note in a song, or every street in your town. Now imagine trying to do it using only the numbers 1 and 0. Every time you use the Internet to watch a movie, listen to...

In this short math video we will understand place value & rounding rules. We are asked to round to the nearest ten thousand. We will review rounding rules and understand that we look at the digit to the right of the place value we are...

In this short math video we will understand place value & rounding rules. We are asked to round to the nearest ten thousand. We will review rounding rules and understand that we look at the digit to the right of the place value we are...

In this math shorts, we’ll learn how to determine which of four numbers could round to a given value when rounded to the hundredths place!
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Howcast -No calculator handy? Here's how to divide numbers the old-fashioned way.

Howcast -Learn how to write numbers correctly from Gotham Writers' Workshop instructor Stephanie Paterik in this Howcast grammar video.

Pupil outcome: I can correctly form the numerals 6-10. Key learning points: - A numeral is a digit that represents a number. - The numerals 6, 7, 8 and 9 are made using one continuous movement and without lifting your pencil. - The...

Pupil outcome: I can count more efficiently by grouping objects into tens and then counting the groups of tens and extra ones. Key learning points: - Ten ones are equivalent to one ten. - When counting larger groups, it is more efficient...

Pupil outcome: I can explore the counting sequence for counting to 100 and beyond. Key learning points: - There is set counting sequence for counting to 100 and beyond. - The patterns in the numbers make counting to 100 and beyond...

Pupil outcome: I can explain the relationship between multiplying a number by 100 and multiples of 100 Key learning points: - Finding one hundred times as many is the same as multiplying by 100 - When a number is multiplied by one...

Pupil outcome: I can explain the relationship between multiplying a number by 10 and multiples of 10 Key learning points: - 10 is ten times the size of 1 - A digit in the tens column is 10 times the value of a digit in the ones column -...

Pupil outcome: I can state the value of any digit in any given integer in any given form. Key learning points: - An integer can be read aloud in different ways. - Context may affect how an integer is read aloud. - An integer can be...