Videos to help Grade 5 students learn how to fluently multiply multi-digit whole numbers using the standard algorithm and using estimation to check for reasonableness of the product.

Common Core Standards: 5.OA.1, 5.OA.2, 5.NBT.5

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Lesson Plans and Worksheets for Grade 5

Lesson Plans and Worksheets for all Grades

More Lessons for Grade 5

Common Core For Grade 5

New York State Common Core Math Module 2, Grade 5, Lesson 8

Lesson 8 Concept Development

Problem 1

314 × 236

Problem 2

1,882 × 296

Problem 3

4,902 × 408

1. Estimate the product first. Solve by using the standard algorithm. Use your estimate to check the reasonableness of the product.

c. 739 × 442

i. 987 × 3,105

g. 530 × 2,075

628 × 335

2,403 × 545

a. 213 × 328

b. 662 × 372

2. Each container holds 1 L 275 mL of water. How much water is in 609 identical containers? Find the difference between your estimated product and precise product.

In this video, we take a look at the relationship between an estimate and an exact product within complex multiplication problems.

1. Estimate the product first. Solve by using the standard algorithm. Use your estimate to check the reasonableness of the product.

a. 312 × 149

b. 743 × 295

c. 428 × 637

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.