Florida B.E.S.T. MA.1.NSO.2.4

Math1st GradeDevelop an understanding of addition and subtraction operations with one- and two-digit numbers.

The Standard

Explore the addition of a two-digit number and a one-digit number with sums to 100.

Florida B.E.S.T. Standards for Mathematics

Teacher's field guide

What Students Need to Do: Students add a small amount to a number made of tens and ones. They use objects, drawings, or place-value thinking to find sums no greater than 100.
What Mastery Looks Like: Students can model and solve problems such as 42 + 6 and 58 + 7. They can explain when the ones stay separate and when 10 ones become a new ten.
Common Misconceptions: Students may add the ones digit to the tens digit, so 34 + 5 becomes 84. They may also forget that 10 ones can be traded for 1 ten.
How to Assess It: Give students 47 + 6. Ask them to solve it with a drawing, write the sum, and explain what happens to the ones.

Lesson moves

Have students build two-digit numbers with base-ten blocks, add loose cubes, and trade 10 cubes for a ten rod when needed.
Show 38 + 7 and ask students to draw the tens and ones, then write how they found the sum.
Students draw a two-digit card and a 1 to 9 card, add them, and keep the cards if their answer is correct.
Set up a sticker shop with sheets of 10 and single stickers, then ask students to find totals after receiving more stickers.

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