Place value is a vague concept for many students. Often we think of 10 as ten individual marbles or 10 individual cookies but when we look more at place value it shifts how we think about numbers. Place value has to do with groups. The tens position tells us how many groups of 10 there are, so the number 10 means one group of 10 and zero individual ones.
All of the place values are based on this group concept. When there gets to be too many tens we then group in terms of 100s and that place value is called the hundreds place. So the number 234 is two groups of 100, three groups of 10 and four individual ones. If you understand place value it will help you with many other math topics.
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