It’s no surprise that kids almost always transpose the teen numbers. We hear – and write – the ten’s place followed by the one’s place. Since we write from left to right, this is easy to record:Įxamine any number between 20-99 and you’ll see that every number is spelled first with the ten’s digit then the one’s digit.
For example, say the number twenty-three:įirst you hear the ten’s place - twenty. In two-digit numbers, you can hear and write two word parts or morphemes. Let’s look at how the words for most two-digit numbers are spelled. To get to the bottom of this conundrum, we need to investigate English spelling! Dig a little deeper, and you’ll discover that the teen numbers are more complex than they seem. Because we’re so fluent with numbers, it’s sometimes hard to understand why kids transpose them. Why Do Students Transpose Numbers?Īs adults, we’ve been working with numerals for decades, so it’s an effortless task. Some kids get tripped up both both transpositions and reversals. Click here to find my free article on reversals and my paid program for stopping number reversals. First, let’s figure out why students are confused.Īnother type of mistake is writing the mirror image of a numeral, and we usually call those mistakes reversals. Today, I want to empower you with effective tools for addressing transposition errors. Mistakes with numbers greater than twenty may indicate that the child needs more place-value practice. These mistakes with the teen numbers actually reveal the child has a good understanding of the spelling patterns for numbers and words. For my students, the most commonly transposed numbers are the numbers 12-19. Transposition errors often occur in two-digit numbers. When students transpose numbers, they write down all of the correct numbers, but they don’t put the numbers into the right sequence (place-value order). This common mistake is sometimes called a transposition. It’s not unusual to hear students confusing the numbers “13” and “31” or writing the number “14” as “41.”
Two-digit numbers puzzle many younger students. Talk to any kindergarten teacher, and she’ll tell you about her students who transpose numbers.
0 kommentar(er)
