Mathematics Grade 3 15 min

Add three numbers up to three digits each: word problems

Add three numbers up to three digits each: word problems

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Introduction & Learning Objectives

Learning Objectives Identify the three numbers (addends) to be added from a word problem. Set up a vertical addition problem, correctly aligning three 3-digit numbers by place value. Add the ones column and regroup to the tens column when the sum is 10 or more. Add the tens column, including any regrouped number, and regroup to the hundreds column if necessary. Add the hundreds column, including any regrouped number, to find the final sum. Write the final answer in a complete sentence that directly answers the question asked in the word problem. Your school is tracking recycling! ♻️ If the first graders collected 112 cans, second graders collected 230 cans, and third graders collected 185 cans, how could you find the grand total? In this lesson, you will become a math detec...
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Key Concepts & Vocabulary

TermDefinitionExample Word ProblemA math problem that is presented as a short story or a real-life situation. You have to read to find the numbers and the question."A farm has 125 chickens, 84 cows, and 210 sheep. How many animals are there in all?" is a word problem. AddendAny of the numbers that are being added together.In the problem 150 + 200 + 50 = 400, the numbers 150, 200, and 50 are the addends. SumThe answer you get when you add numbers together. It's the total.In the problem 150 + 200 + 50 = 400, the number 400 is the sum. Place ValueThe value of a digit based on its position in a number. We focus on the Ones, Tens, and Hundreds places.In the number 528, the 8 is in the ones place, the 2 is in the tens place (worth 20), and the 5 is in the hundreds place (worth 50...
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Core Formulas

Vertical Alignment Rule H T O A A A B B B +C C C ------ When setting up your problem, always line up the numbers so the ones are in the ones column, tens in the tens column, and hundreds in the hundreds column. This ensures you add the correct parts of each number. Right-to-Left Addition Rule Step 1: Add Ones -> Step 2: Add Tens -> Step 3: Add Hundreds Always start adding in the column furthest to the right (the ones place). Work your way left, one column at a time, from ones to tens to hundreds. Regrouping Rule If Sum of Column >= 10, carry the tens digit to the next column. If the sum of any column is a two-digit number (like 17), write the ones digit (7) as the answer for that column and carry the tens digit (1) to the top of the next column to the left...

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Sample Practice Questions

Challenging
For the first day of school, a parent bought a pack of 120 sheets of lined paper, a notebook with 75 sheets, and a sketchbook with 50 sheets. They also bought a box of 24 crayons. How many sheets of paper did the parent buy in total?
A.195
B.125
C.269
D.245
Challenging
A zookeeper is checking the populations of three types of monkeys. The zoo has 112 squirrel monkeys, 98 howler monkeys, and 105 capuchin monkeys. The zoo also has 45 lemurs. How many monkeys does the zoo have in total?
A.210
B.315
C.203
D.360
Challenging
A bake sale sold four items. They sold 135 cookies, 85 brownies, 110 cupcakes, and 40 pies. How many baked goods were sold in total that were NOT pies?
A.330
B.220
C.195
D.370

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