1.2.B
The Standard
use concrete and pictorial models to compose and decompose numbers up to 120 in more than one way as so many hundreds, so many tens, and so many ones
Texas Essential Knowledge and Skills for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students build a number with objects or drawings and identify its hundreds, tens, and ones. They show the same total in at least two ways, such as 43 as 4 tens and 3 ones or 3 tens and 13 ones.
What Mastery Looks Like
- A student can build or draw any given number through 120 and correctly label each place. The student can regroup a hundred or a ten, explain that the total stays the same, and check by counting.
Common Misconceptions
- Students may treat the 1 in 105 as one rather than one hundred. They may think a number has only one correct grouping or forget that one ten can be traded for ten ones. A zero may cause them to omit a place entirely.
How to Assess It
- Exit ticket: Draw 114 in two different ways with base-ten pictures. Label how many hundreds, tens, and ones appear in each drawing.
Lesson moves
Ways to Teach It
Give pairs base-ten blocks and number cards; students build each number, trade one ten or hundred, and sketch both versions.
Show two models of 76 and have students explain in writing how both models represent the same total.
Play Place Value Match: students pair number cards with two different picture cards that show the same amount.
Bundle 112 craft sticks for a supply order, then record the amount using a bundle of 100, bundles of 10, and singles.
Keep exploring
Related Standards
- 3.2.A
compose and decompose numbers up to 100,000 as a sum of so many ten thousands, so many thousands, so many hundreds, so many tens, and so many ones using objects...
- 1.3.A
use concrete and pictorial models to determine the sum of a multiple of 10 and a one-digit number in problems up to 99
- 1.2.C
use objects, pictures, and expanded and standard forms to represent numbers up to 120
- 2.2.A
use concrete and pictorial models to compose and decompose numbers up to 1,200 in more than one way as a sum of so many thousands, hundreds, tens, and ones
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