All the solutions provided in **McGraw Hill Math Grade 4 Answer Key PDF Chapter 4 Lesson 1 Multiples of 10, 100, and 1,000** will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 4 Answer Key Chapter 4 Lesson 1 Multiples of 10, 100, and 1,000

**Math in My World**

Example 1.

The whale shark is the world’s largest fish. Its mouth is 5 feet long, and each foot contains 600 teeth. How many teeth does a whale shark have?

Find 5 × 600. Use basic facts and patterns. 600 is a multiple of 10.

5 × 6 = __30 __ 5 × 6 ones = 30 ones = 30

5 × 60 = __300__ 5 × 6 tens = 30 tens = 300

5 × 600 = __3000__ 5 × 6 hundreds = 30 hundreds = 3,00

So, a whale shark has ____ teeth.

Notice that the product is 5 × 6 with two zeros at the end.

Answer:

Given that is

5 x 600.

5 × 6 = 30, 5 × 6 ones = 30 ones = 30.

5 × 60 = 300, 5 × 6 tens = 30 tens = 300.

5 × 600 = 3000, 5 × 6 hundreds = 30 hundreds = 3000.

So, a whale shark has 3000 teeth.

Example 2.

Find 3 × 7,000.

3 × 7 = __21__ 3 × 7 ones = 21 ones = 21

3 × 70 = __210__ 3 × 7 tens = 21 tens = 210

3 × 700 = __21,000__ 3 × 7 hundreds = 21 hundreds = 2,100

3 × 7,000 = __210,000__ 3 × 7 thousands = 21 thousands = ____

So, 3 × 7,000 is ____.

Notice that the product is 3 × 7 with three zeros at the end.

Answer:

Given that,

3 × 7,000.

3 × 7 = 21, 3 × 7 ones = 21 ones = 21.

3 × 70 = 210, 3 × 7 tens = 21 tens = 210.

3 × 700 = 21,000, 3 × 7 hundreds = 21 hundreds = 2,100.

3 × 7,000 = 210,000, 3 × 7 thousands = 21 thousands = 21,000.

So, 3 × 7,000 is 21,000.

Example 3.

The weight of a fire truck is 8 × 4,000 pounds. What is its weight in pounds?

Let w represent the weight.

Write an equation.

w = 8 × ____

You need to find 8 × 4,000.

8 × 4 = ____ 8 × 4 ones = ____ ones = ____

8 × 40 = _____ 8 × 4 tens = ____ tens = ____

8 × 400 = ____ 8 × 4 hundreds = ___ hundreds = ____

8 × 4,000 = ____ 8 × 4 thousands = ____ thousands = ____

Answer:

Given that,

The weight of a fire truck is 8 × 4,000 pounds.

weight w = 8 × 4,000

Know find 8 × 4,000.

8 × 4 = 32, 8 × 4 ones = 32 ones = 32.

8 × 40 = 320. 8 × 4 tens = 32 tens = 320.

8 × 400 = 3200, 8 × 4 hundreds = 32 hundreds = 32,00

8 × 4,000 = 32,000 8 × 4 thousands = 32 thousands = 32,000.

**Talk Math**

What is the product of 4 and 5,000? Explain why there are more zeros in the product than in the factors in the problem.

Answer:

Given that,

4 x 5,000.

4 × 5 = 20, 8 × 5 ones = 20 ones = 20.

4 × 50 = 200. 8 × 5 tens = 20 tens = 200.

4 × 500 = 2000, 8 × 5 hundreds = 20 hundreds = 20,00

4 × 5,000 = 20,000 8 × 5 thousands = 20 thousands = 20,000.

So, 4 x 5,000 = 20,000.

**Guided Practice**

**Multiply. Use basic facts and patterns.**

Question 1.

6 × 8 = 48

6 × 80 = ____

6 × 800 = ____

6 × 8,000 = ____

Answer:

6 × 8 = 48, 6 × 8 ones = 48 ones = 48.

6 × 80 = 480, 6 x 8 tens = 48 tens = 480.

6 × 800 = 4,800, 6 x 8 hundreds = 48 hundreds = 4,800.

6 × 8,000 = 48,000, 6 x 8 thousands = 48 thousand = 48,000.

Question 2.

7 × 9 = 63

7 × 90 = ____

7 × 900 = ___

7 × 9,000 = ____

Answer:

7 x 9 = 63, 7 x 9 ones = 63 ones = 63.

7 x 90 = 630, 7 x 9 tens = 63 tens = 630.

7 x 900 = 6300, 7 x 9 hundreds = 63 hundreds = 6,300.

7 x 9,000 = 63,000, 7 x 9 thousands = 63 thousands = 63,000.

**Multiply. Use mental math.**

Question 3.

8 × 600 = ____

Answer:

Given that,

8 x 600.

8 × 6 = 48, 6 × 8 ones = 48 ones = 48.

8 × 60 = 480, 6 x 8 tens = 48 tens = 480.

8 × 600 = 4,800, 6 x 8 hundreds = 48 hundreds = 4,800.

Question 4.

9 × 9,000 = _____

Answer:

9 x 9 = 81, 9 x 9 ones = 81 ones = 81.

9 x 90 = 810, 9 x 9 tens = 81 tens = 810.

9 x 900 = 8100, 9 x 9 hundreds = 81 hundreds = 8,100.

9 x 9,000 = 81,000, 9 x 9 thousands = 81 thousands = 81,000.