Place value example with 42 | Place value (tens and hundreds) | Early Math | Khan Academy | Summary and Q&A

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April 15, 2014
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Khan Academy
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Place value example with 42 | Place value (tens and hundreds) | Early Math | Khan Academy

TL;DR

Learn how to represent quantities using the digits 0-9 and understand the concept of place value.

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Questions & Answers

Q: How can we represent a quantity using digits?

To represent a quantity using digits, we group it into tens and count the remaining ones. The result can be written as "number of tens" plus "number of ones." For example, 4 tens and 2 ones can be represented as 42.

Q: What is the significance of place value?

Place value refers to the value of a digit based on its position in a number. In our number system, each place represents a power of 10. The ones' place indicates the number of ones, and the next place indicates the number of tens.

Q: How do we determine the number of tens and ones in a quantity?

To determine the number of tens, we group the quantity into groups of ten. The remaining ones are counted separately. Each group of ten can be represented as 10, and the number of ones is represented using the digits 0-9.

Q: How does the representation of "42" relate to the concept of place value?

The representation "42" signifies 4 tens and 2 ones. The digit 4 in the tens' place represents 40, as each group of ten is equivalent to 10. The digit 2 in the ones' place represents 2 single units.

Summary & Key Takeaways

  • The video demonstrates how to group a quantity into groups of ten and determine the remaining ones.

  • The example used is four groups of ten and two remaining ones, which is represented as 42.

  • This highlights the importance of place value, with the ones' place representing the number of ones and the next place representing the number of tens.

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