LEARN NC

K–12 teaching and learning · from the UNC School of Education

Goal 1

Number and Operations - The learner will read, write, model, and compute with whole numbers through 999.

Objective 1.04

Develop fluency with multi-digit addition and subtraction through 999 using multiple strategies.

  • Strategies for adding and subtracting numbers.
  • Estimation of sums and differences in appropriate situations.
  • Relationships between operations.

Resources aligned to this objective

Sum calculator fun
Students work in pairs to practice math facts and use calculators to check answers.
Format: lesson plan (grade 2 Mathematics)
By Laurie Melton.
Sorting seeds
This lesson will engage students in manipulating, sorting, counting, and graphing seeds. The students will be involved in the creation of a graph using the computer.
Format: lesson plan (grade 2 Mathematics)
By Mary Jackson.
Making change to $1.00.
In this lesson students will work in small groups making change to $1.00 using coins and pictures of items priced from Sunday fliers. In advance the teacher will cut out pictures of items costing less than $1.00.
Format: lesson plan (grade 2 Mathematics)
By Julie Hohns.
Let's trade (regrouping to subtract)
This word (trade) will introduce regrouping to subtract by allowing students to "trade" manipulatives to regroup.
Format: lesson plan (grade 2 Mathematics)
By Sarah Cole.

Resources on the web

Where Will I Land?
Students find differences using the number line, a continuous model for subtraction. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
What's the Difference?
Students use reasoning to find differences from numbers up to 10, using real and virtual calculators and an addition chart as tools. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
What's Left?
Students practice addition facts. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
What balances?
In this lesson, one of a multi-part unit from Illuminations, students explore another meaning of subtraction: the balance. (Learn more)
Format: lesson plan (grade 2 Mathematics)
Provided by: National Council of Teachers of Mathematics
Try for Five
Students explore the many ways to decompose numbers and then build on their knowledge of addition and subtraction to find missing addends. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
Taking Away Sets
Students explore another model for subtraction, the familiar set model. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
Take Away
Introduces elementary students to subtraction by creating a link between students' experiences and mathematics. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
Sum Search
Students practice addition facts in a concentration-game format using dominoes. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
Some Special Sums
Students practice doubles and doubles-plus-one addition facts. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
Seeing Doubles
Students focus on dominoes with the same number of spots on each side and on the related addition facts. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
Recording Two Ways
Students make sets of pasta shapes and count some away, then record the subtraction in vertical and horizontal formats. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
Pyramid Power
Students make sets of a given number, explore relationships between numbers, and write numbers that name how many elements are in a group. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
Practice Makes Perfect
Students focus on differences of numbers from 10. Students use a real or virtual calculator and play a concentration game. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
Plenty of Practice
Students construct a bulletin board display that focuses on sums of 9, 10, 11, and 12. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
Numbers Many Ways
Students work with subtraction at the intuitive level as they explore number families and ways to decompose numbers to 10. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics
Number Cents: Looking Back and Moving Forward
Students discuss and model prices, review the money words they've learned, and play games to facilitate continuing practice. (Learn more)
Format: lesson plan (grade K–2 Mathematics)
Provided by: National Council of Teachers of Mathematics