Wyoming Math 1.NBT.4c
The Standard
Add within 100, using concrete models or drawings and strategies based on place value: Understand that in adding two-digit numbers, adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
2023 Wyoming Mathematics Content and Performance Standards · Use place value understanding and properties of operations to add and subtract.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students add two-digit numbers by combining tens with tens and ones with ones. When they have 10 or more ones, they make a new ten.
What Mastery Looks Like
- A student can draw 27 and 35 as tens and ones, then show 12 ones becoming 1 ten and 2 ones. They can explain why the sum is 62.
Common Misconceptions
- Some students write 512 for 5 tens and 12 ones. Others count the 12 ones but forget to turn 10 of them into another ten.
How to Assess It
- Ask students to solve 36 + 27. Have them draw tens and ones, circle any group of 10 ones, and write the sum.
Lesson moves
Ways to Teach It
Give pairs 27 straws and 35 straws, then have them bundle loose straws into groups of ten and count the total.
Ask, “Where does the extra ten come from in 28 + 34?” Have students draw and explain their answer.
Draw tens digits from 1, 2, 3 and ones digits from 0 to 9, make two numbers, then add with blocks.
A class has 28 pencils and gets 34 more; draw bundles of ten to find the new total.
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Printable 1.NBT.4c Worksheet
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