Wyoming Math 1.NBT.4b

Math1st GradeNumber and Operations in Base Ten

The Standard

Add within 100, using concrete models or drawings and strategies based on place value: Adding a two-digit number and a multiple of 10.

2023 Wyoming Mathematics Content and Performance Standards · Use place value understanding and properties of operations to add and subtract.

Teacher's field guide

What Students Need to Do: Students add a two-digit number and a number like 20 or 30, with sums no greater than 100. They use objects or drawings to show the tens and ones, then write the sum.
What Mastery Looks Like: For 46 + 30, a student draws four tens and six ones, adds three tens, and writes 76. They explain that the tens change but the six ones stay the same.
Common Misconceptions: Some students read 30 as 3 and answer 49 for 46 + 30. Others add 3 to both digits and answer 79 instead of changing only the tens.
How to Assess It: On an exit ticket, ask students to solve 52 + 30, draw the tens and ones, and circle the digit that stayed the same.

Lesson moves

Give pairs four bundles of ten straws and six loose straws, then add three bundles and record the total.
Write 46 + 30 = 49 on the board and ask students to explain the mistake with a tens-and-ones drawing.
Make cards numbered 21 to 59 and cards marked 10, 20, or 30; partners draw one of each and sketch the sum.
Tell students a library has 34 picture books and gets 20 more; have them draw tens and ones to find the new total.

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