Mastering Multiplication of 2-Digit Numbers

The video tutorial covers multiplying by two-digit numbers, starting with an introduction and lesson overview. It explains estimation in multiplication using place value, followed by a step-by-step guide on multiplying by ones and tens. The tutorial also demonstrates adding partial products to find the final result. Additionally, it includes an estimation of a tiger's sleep in a year and discusses the importance of precision in mathematical calculations.

What is the main topic of Lesson 1.7?

• Dividing by two-digit numbers

• Adding two-digit numbers

• Subtracting two-digit numbers

• Multiplying by two-digit numbers

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

What is the first step in solving the problem of how much food a tiger eats in 28 days?

• Multiply by the ones

• Estimate

• Multiply by the tens

• Add the partial products

Tags

CCSS.3.OA.D.8

When estimating, what do we round 28 to?

• 25

• 35

• 30

• 20

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

What is the partial product of 28 times 8?

• 504

• 224

• 280

• 600

Tags

CCSS.4.NBT.B.5

Why do we put a zero in the ones place when multiplying by the tens?

• To make the number larger

• To keep the digits aligned

• To make the number smaller

• To avoid carrying over

Tags

CCSS.4.NBT.B.5

How many hours does a Siberian tiger sleep in a day?

• 12 hours

• 24 hours

• 18 hours

• 6 hours

What is the estimated product of 126 hours per week and 52 weeks in a year?

• 6000

• 8000

• 7000

• 5000

Tags

CCSS.4.NBT.B.5

What is the actual product of 126 times 52?

• 5040

• 6552

• 6000

• 7000

Tags

CCSS.5.NBT.B.5

What does Mathematical Practice 6 emphasize?

• Speed

• Precision

• Creativity

• Teamwork

Why is it important to use a placeholder zero when multiplying by tens?

• To make the number larger

• To make the calculation easier

• To avoid mistakes

• To ensure the digits are aligned correctly

Tags

CCSS.4.NBT.B.5