A STORY OF UNITS
Observational Assessment
K •5
Grade K • Module 5
Numbers 10–20 and Counting to 100 Assessment Overview
Learning numbers 10–20 is the first opportunity for Kindergarten students to engage with our base ten number system. Understanding teen numbers is important to understanding place value. This is the first group of numbers that has two digits, each representing different units, tens and ones. When assessing students on this foundational math concept, it is helpful to be aware of teen number misconceptions. Teen Number Misconceptions: • The names of numbers 11–12 (eleven and twelve) do not name the ones and give no indication that there is a ten in the number. • The names of numbers 13–19 name the ones, with the exception of thirteen and fifteen, but students have to make a mental jump from “teen” to “ten”. • When writing teen numbers, the ten is written first. This is opposite of how they are spelled and spoken (see image).
Fourteen 1
4
When writing teen numbers, the ten is written first. This is opposite of how they are spelled and spoken.
Module 5—FAQs •
What is the difference between the two statements below when assessing Kindergarten standard K.1?
10 ones and 4 ones 1 ten and 4 ones The first representation of 14 is expressed using a single unit, ones. Renaming 10 ones as 1 ten is not a Kindergarten standard. Understanding teen numbers as 10 ones and some further ones is crucial to understanding that 10 of a lower value unit is the same as 1 of the next higher unit as organized in place value charts. Renaming 10 ones as 1 ten formally happens in Grade 1 Module 2. Don’t discourage students from recognizing 1 ten in teen numbers; simply remind them that it took 10 ones to make 1 ten and the digit 1 in teen numbers represents 10 ones. •
Can I start assessing counting to 100 sooner in M5? Counting past teen numbers either by ones or by tens begins in lesson 15. Your students may be ready or need to start working on these key concepts earlier in the module for more practice. Fluency activities focused on counting past teen numbers by ones and tens begin in lesson 16 and may be used starting in lesson 1 of the module, either as an extension or addition to the listed fluency.
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