Florida B.E.S.T. MA.1.NSO.1.3
The Standard
Compose and decompose two-digit numbers in multiple ways using tens and ones. Demonstrate each composition or decomposition with objects, drawings and expressions or equations.
Florida B.E.S.T. Standards for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students build a two-digit number, then break it into tens and ones in more than one way. They show each way with materials, a drawing, and an equation.
What Mastery Looks Like
- For 46, a student can show 4 tens and 6 ones, then trade a ten to show 3 tens and 16 ones. They draw both models and write 46 = 40 + 6 and 46 = 30 + 16.
Common Misconceptions
- Students may read 42 as 4 + 2 instead of 40 + 2. They may think a number has only one tens-and-ones form. When trading one ten for 10 ones, they may change the total by mistake.
How to Assess It
- Exit ticket: Show 52 two ways, including one way that does not use 5 tens. Draw each model and write an equation for each.
Lesson moves
Ways to Teach It
Give pairs bundled and loose straws; call 37, then have them build it, trade one bundle for ten straws, and record both equations.
Have students draw and answer the prompt: How can 28 have 1 ten and 18 ones while staying equal to 28?
Play Match the Number with cards showing numerals, block pictures, and equations such as 43 = 30 + 13.
Use dimes and pennies to show a 34-cent price, then exchange one dime and record the new tens-and-ones equation.
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Printable MA.1.NSO.1.3 Worksheet
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