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Lesson Table Topics Discussion Quiz: Class Homework

Steps-1

Title: Multiplication

Grade 4+ Lesson s1-l7

Explanation: Hello Students, time to practice and review the steps for the problem.

Quiz: Discussion Step

Discussion: Steps1 Steps2 Steps3 Steps4 Steps5

sbMath-row-a-ones-image1000 = {sbMath-row-a-ones-image1000}

Step

Value

Image

1

45
Factor

05

1

1

1

1

1

:

40

10

10

10

10

:

2

21
Factor

01

1

:

20

10

10

:

3

945
Product

05

1

1

1

1

1

:

40

10

10

10

10

:

900

100

100

100

100

100

:

100

100

100

100

Step Description A B C D

B1

Carry

9

10

0

M1

Multiplicand

0

4

5

M2

Multiplier

×

2

1

A1

D3 21 × 5 = 105 C3 21 × 4 + 9 = 94 B3 21 × 0 + 9 = 9

0 9

9 84 10

10 105 5

S1

D3 Bring Down 9 C3 Bring Down 4 B3 Bring Down 5

9

4

5

Sum

Product: 45 x 21 = 945

9

4

5
Id Type Name Note

1

Problem

Find the product of 45 and 21.

2

Step

Product means Multiplication.
\$\times\$

3

Step

Multiply the number 45 with 21

45 × 21

4

Step

After the multiplication and we get

945

5

Sumup

Please summarize steps

Choices

6

Choice-A

Incorrect. The product of 45 and 21 is 945 and not 845

Wrong 845

7

Choice-B

Correct. The product of 45 and 21 is indeed 945

Correct 945

8

Choice-C

Incorrect. The product of 45 and 21 is 945 and not 745

Wrong 745

9

Choice-D

Incorrect. The product of 45 and 21 is 945 and not 645

Wrong 645

10

Answer

Option

B

11

Sumup

Please summarize choices

Discussion: Steps1 Steps2 Steps3 Steps4 Steps5

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