Florida B.E.S.T. MA.2.NSO.2

MA.2.NSO.2 is a B.E.S.T. standard. These are the benchmarks under it.

• MA.2.NSO.2.1

  Recall addition facts with sums to 20 and related subtraction facts with automaticity.

• MA.2.NSO.2.2

  Identify the number that is ten more, ten less, one hundred more and one hundred less than a given three-digit number.

• MA.2.NSO.2.3

  Add two whole numbers with sums up to 100 with procedural reliability. Subtract a whole number from a whole number, each no larger than 100, with procedural rel...

• MA.2.NSO.2.4

  Explore the addition of two whole numbers with sums up to 1,000. Explore the subtraction of a whole number from a whole number, each no larger than 1,000.

01

What Students Need to Do

Students combine and separate quantities represented by numbers through 999. They use place value to regroup ones, tens, or hundreds and record their work with equations, drawings, or written steps.

02

What Mastery Looks Like

Given mixed problems, the student aligns place values and calculates accurately, including when regrouping is needed. The student can explain each trade and use estimation or the opposite operation to check an answer.

03

Common Misconceptions

Students may align numbers by their left edges instead of matching hundreds, tens, and ones. They may subtract the smaller digit from the larger digit in each column or skip a needed trade. Some treat a regrouped 1 as one unit instead of one ten or one hundred.

04

How to Assess It

Exit ticket: Solve 268 + 157 and 402 − 186. Show each trade with a quick base-ten sketch or place-value labels, then check one answer using the opposite operation.

1. 01

   Use base-ten blocks to model 243 + 128 and 351 − 176, trading ones and tens before recording each written step.

2. 02

   Ask, “How are 286 + 157 and 286 + 160 alike, and how can the second problem help solve the first?”

3. 03

   Partners roll dice to build two three-digit numbers, draw an operation card, solve, then check each other’s place-value alignment.

4. 04

   Give students a school-supply order and budget, then have them find the total cost and money left using whole-dollar prices.

• MA.3.NSO.2.1

  Add and subtract multi-digit whole numbers including using a standard algorithm with procedural fluency.

• MA.5.NSO.2

  Add, subtract, multiply and divide multi-digit numbers.

• MA.5.NSO.2.3

  Add and subtract multi-digit numbers with decimals to the thousandths, including using a standard algorithm with procedural fluency.

• MA.3.NSO.2

  Add and subtract multi-digit whole numbers. Build an understanding of multiplication and division operations.