National Security Agency
Borrowing from Our Neighbors
Young mathematicians explore two-digit subtraction. They will investigate multiple ways to subtract numbers involving regrouping. Resources are provided.
Curated OER
Lesson Design Protocol: Add and Subtract
Addition and subtraction are studied in this math instructional activity. Upper graders add and subtract whole numbers up to 1,000 with and without regrouping.
Curated OER
Fun Math Worksheet 48
For this addition worksheet, students add five digit numbers together to find a sum. Students complete 15 addition problems with and without regrouping.
Curated OER
Subtracting With the Hundreds Place And Regrouping
Learners solve math problems involving subtracting with regrouping. They practice the steps for subtracting in the hundreds place with regrouping, through teacher guided practice. Independently, pupils complete story problems involving...
Curated OER
Pac Man Subtraction
Third and fourth graders engage in a game using visual symbols, auditory responses and tactile stimuli to further their understanding of subtraction. A worksheet imbedded in this plan explains how to teach the game.
Math Salamanders Ltd.
Column Subtraction - Money 4-Digits Sheet 1
Here is a column subtraction of money with four digits worksheet in which youngsters solve 12 problems without regrouping and eight problems with regrouping.
Curated OER
Column Subtraction - 3 Digits Sheet 1
In this column subtraction worksheet, learners review rules to help them complete three digit subtraction. They solve the equations using the column subtraction method.
Curated OER
Add or Subtract Whole Numbers Up to 1000
Elementary schoolers solve practice problems on the board and are shown how to line up the numbers for addition. They solve various addition problems in small groups. Everyone continues the same process for solving subtraction problems.
Curated OER
Story Problems
Youngsters learn how to solve story problems. They listen to story problems, learn how to identify important information in a problem, and observe how to solve a story problem. Pupils practice solving an addition story problem with a...
Curated OER
Problem Solving - Adding Whole Numbers
In order to practice problem-solving skills, pupils work through a series of word problems. They each determine an answer and then share their thinking process with the class. This lesson demonstrates that there may be more than one way...
Math Salamanders Ltd.
Column Subtraction - 4 Digits Sheet 4
In this column subtraction with four digits worksheet, students subtract, rename, and keep the columns aligned to get the correct answer.
Curated OER
Add It Up In Number Ville! Adding 2-Digit Numbers With and Without Regrouping
Students explore adding 2-digit numbers. In this math lesson, students identify 2-digit numbers and use base ten blocks to practice adding. Students use addition to break a code.
Curated OER
Number Base Clocks
Young scholars investigate place value in base ten. In this number sense instructional activity, students participate in an online instructional activity at www.shodor.org/interactivate/activities/NumberBaseClocks and demonstrate how to...