Florida B.E.S.T. MA.1.AR.1.1

Math1st GradeSolve addition problems with sums between 0 and 20 and subtraction problems using related facts.

The Standard

Apply properties of addition to find a sum of three or more whole numbers.

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

Teacher's field guide

What Students Need to Do: Students add three or more whole numbers with totals no greater than 20. They change the order or grouping to make easier pairs, such as making ten.
What Mastery Looks Like: Students rearrange or group addends to make friendly pairs, such as 8 and 2. They find the correct total and explain why changing the order or grouping does not change it.
Common Misconceptions: Students may think changing the order changes the total. They may skip an addend, count one twice, or combine numbers without keeping the full expression intact.
How to Assess It: Exit ticket: Solve 8 + 2 + 5, circle the pair you added first, then show a different order that gives the same total.

Lesson moves

Give students three colors of counters to model 7 + 3 + 4, then regroup the counters to find the total efficiently.
Ask, “Which two numbers would you add first in 6 + 4 + 7, and why?”
Deal three number cards to each student and award a point for rearranging them to make an easy pair before finding the sum.
Set up a class store receipt with three item prices under 20 cents and have students choose the easiest order for adding them.

Free download

$Preview of the MA.1.AR.1.1 printable worksheet$

A ready-to-print activity worksheet aligned to MA.1.AR.1.1, 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.