Wyoming Math 1.NBT.4a

Math1st GradeNumber and Operations in Base Ten

The Standard

Add within 100, using concrete models or drawings and strategies based on place value: Including adding a two-digit number and a one-digit number.

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 one-digit number to a two-digit number by keeping track of tens and ones. They use blocks or drawings and make a new ten when the ones reach ten.
What Mastery Looks Like: For 27 + 5, a student shows two tens and twelve ones, then trades ten ones for a ten. They write 32 and explain why the answer has three tens and two ones.
Common Misconceptions: Some students add the extra ones to the tens digit, giving 77 for 27 + 5. Others write 212 because they put 12 ones next to 2 tens without making a new ten.
How to Assess It: Exit ticket: Solve 38 + 5. Draw tens and ones, circle ten ones to make a new ten, and write the sum.

Lesson moves

Give pairs two ten-sticks, seven unit cubes, and five more cubes; have them trade ten cubes for a ten-stick and record the sum.
Ask: How can 29 + 4 have three tens when 29 has only two? Have students draw and explain.
Play Card and Die Add: draw a card numbered 20 to 89, roll a die, then sketch tens and ones to find the sum.
Tell students a class has 28 pencils and gets 5 more; have them draw tens and ones to find the new total.

Free download

$Preview of the 1.NBT.4a printable worksheet$

A ready-to-print activity worksheet aligned to 1.NBT.4a, with an answer key for the teacher on its own page. No account needed.

PDF, US Letter, prints cleanly in black and white.

Keep exploring

Grade, subject, topic, and the complete standard are prefilled. Create one free, no account needed.