Florida B.E.S.T. MA.K.NSO.3.1

MathKindergartenDevelop an understanding of addition and subtraction operations with one-digit whole numbers.

The Standard

Explore addition of two whole numbers from 0 to 10, and related subtraction facts.

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

Teacher's field guide

What Students Need to Do: Students combine two groups and find how many there are altogether. They take a total apart and connect the addition fact to matching subtraction facts.
What Mastery Looks Like: Students use objects, drawings, or numbers to find a total and show how the total can be taken apart. They explain connected facts, such as 4 + 3 = 7 and 7 - 3 = 4.
Common Misconceptions: Students may count both groups but restart at one instead of counting on. They may reverse the subtraction order or think adding zero changes a number.
How to Assess It: Give students counters and ask, “Show 6 + 3, then write the addition fact and two subtraction facts for your model.”

Lesson moves

Give pairs ten-frames and counters to model an addition fact, then remove each part to create related subtraction facts.
Ask, “How are 5 + 2 = 7 and 7 - 2 = 5 connected?” Students draw and explain their thinking.
Play a fact-family matching game with cards showing two parts, a total, an addition equation, and related subtraction equations.
Set up a snack problem where students combine two groups of crackers, then eat some and describe the matching equations.

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