Florida B.E.S.T. MA.1.NSO.2.1

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

The Standard

Recall addition facts with sums to 10 and related subtraction facts with automaticity.

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

Teacher's field guide

What Students Need to Do: Students recall addition facts with totals no greater than 10. They also recall the matching subtraction facts quickly, without counting one by one.
What Mastery Looks Like: Students answer mixed addition and subtraction facts within 10 quickly and correctly. They use a known addition fact to recall related subtraction facts without counting each time.
Common Misconceptions: Students may count every object or finger instead of recalling a fact. They may switch subtraction numbers, or miss how addition and subtraction facts belong to one fact family.
How to Assess It: Give a one-minute exit ticket with eight mixed facts, such as 4 + 5, 9 - 4, 3 + 6, and 10 - 7. Check accuracy and quick recall without counting tools.

Lesson moves

Give pairs ten-frames and counters, then have them build a fact and remove the counters before answering from memory.
Ask students to explain how knowing 3 + 6 = 9 helps them solve 9 - 6.
Play fact-family memory with cards showing equations and matching number-family triangles.
Set up a classroom store where students add small item totals and find how many remain from 10 coins.

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