Addition of Three-Digit Numbers

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Questions and Answers

When performing vertical addition, if the sum of digits exceeds ten, what is the procedure?

Write down the sum and carry one to the next digit. (correct)

Write the sum in the tens column.

Ignore the carry and write down the sum.

Only carry if the sum is greater than fifteen.

What should the total amount be if Mom wants to buy a pressure cooker for $350, an electric rice cooker for $218, and a water purifier for $523?

$920

$1091 (correct)

$1180

$1050

If a careless kid summed up 365 + 825 incorrectly due to misreading digits, which of the following would be the correct calculation?

1190 (correct)

1090

1150

1290

If the misreading occurred with 3 mistaken for 8 and 7 for 1, what is the difference calculated between the incorrect and correct sums?

55 Signup and view all the answers

When adding vertically, which of the following statements is true based on the addition rules?

Digits must be lined up according to their place value. Signup and view all the answers

What is the vertical calculation for $234 + 265$?

499 Signup and view all the answers

What is the total number of pots combining chrysanthemums and roses given as $625 + 358$?

983 Signup and view all the answers

What is the correct mental arithmetic to calculate $271 + 31$?

302 Signup and view all the answers

How many pots of chrysanthemums and orchids are there in total for $625 + 286$?

911 Signup and view all the answers

Using vertical addition, what is the result of $471 + 318$?

789 Signup and view all the answers

When performing vertical addition, what must be carried when adding $7 + 3$?

1 Signup and view all the answers

What is the result of combining $271 + 31$ using vertical addition?

302 Signup and view all the answers

What operation is represented by the expression $625 + 286$?

Total number of pots Signup and view all the answers

What should be added to the hundreds place when the sum in the tens place reaches ten during vertical addition?

Add one to the thousands place Signup and view all the answers

In the addition problem 271 + 903, what is the sum of the digits in the hundreds place after carrying over?

11 Signup and view all the answers

When aligning numbers for vertical addition, which digit needs to match in the corresponding places?

All digits must be aligned Signup and view all the answers

What is the correct way to calculate the sum when reaching 271 + 903?

Add 2 and 9, then add carry to the thousands place Signup and view all the answers

What happens to the tens and hundreds digit sum if the sum in the hundreds exceeds ten?

It requires carrying over to a higher place value Signup and view all the answers

During a vertical addition, if the sum in the units place equals 10, what action should be taken?

Write down 0 and carry 1 to the tens place Signup and view all the answers

What is an essential consideration to avoid mistakes in vertical addition?

Ensure that all digits are aligned and carry is noted Signup and view all the answers

What is the first step to take when calculating 271 + 31 using vertical addition?

Align the numbers according to their place values Signup and view all the answers

Study Notes

Introduction

The lesson covers addition of three-digit numbers with non-continuous carry.
Review examples include vertical calculations and word problems involving addition of three-digit numbers.

Target

Master the calculation method of adding three-digit numbers with one-time carry.
Understand the formation process of the calculation method.
Develop transferable skills and analogical reasoning.
Cultivate the value of protecting and loving wildlife.

Self-Directed Learning

The goal of the self-directed learning is to determine the number of bird and mammal species in a country's wetlands.

Expression

This section introduces methods for adding 271 and 31 using mental arithmetic and vertical column methods.

Practice

Method 1: Mental Arithmetic: Break down the numbers (271 + 31) into simpler terms (270 + 1 + 30 + 1). Add the hundreds, tens, and ones separately to get the sum (302).
Method 2: Vertical Column: Aligning the digits in columns for ones, tens, and hundreds, perform the addition starting from the ones place (7 + 3 = 10). Carry the 1 to the tens place (1 + 2 + 3 = 6). The sum is 302.

Think About This

The text presents an example of adding 271 and 903.
The sum of the hundreds place is 11 (1 ten + 1 ones).
Carry the 1 (ten) to the thousands place and add it to the tens place.

Summary Tips

When calculating addition in vertical form, align digits properly and pay attention to carry-overs.

Group Discussion

Key points to consider when calculating addition within ten thousand: Proper digit alignment and carrying over 1 when the sum of digits is tens or more.

Consolidation Exercises

Practice problems:
- 365 + 825 = 1190
- 719 + 252 = 971
- 281 + 64 = 345
- 65 + 93 = 158

Expanded Application

A word problem involving addition of three-digit amounts for purchasing household appliances.
A problem identifying and correcting an error in a simple addition problem.

Class Summary

Key points for successful addition: Aligning digits, starting from the ones place, and understanding carry-over rules when the sum of digits exceeds 9.

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Description

This quiz focuses on adding three-digit numbers using techniques that include mental arithmetic and vertical column methods, emphasizing calculations with non-continuous carry. It aims to enhance students' problem-solving skills and understanding through practical examples and word problems.