1. ? 1 ten = 10 ones 1 ten How many ten?
Multiplication by a 1-Digit Number
Intro
How many ten?
1 ten
1 ten = 10 ones ?

2. ? ? ? 1 ten = 10 ones 2 tens = 20 ones 5 tens = 50 ones
Multiplication by a 1-Digit Number
Intro
1 ten = 10 ones ?
2 tens = 20 ones ?
5 tens = 50 ones ?
10 tens = 100 ones

3. ? 10 ones = 1 ten 10 ones How many ones?
Multiplication by a 1-Digit Number
Intro
How many ones?
10 ones
10 ones = 1 ten ?

4. ? 11 ones = 1 ten 1 one 11 ones How many ones?
Multiplication by a 1-Digit Number
Intro
How many ones?
11 ones
11 ones = 1 ten 1 one ?

5. ? ? ? 10 ones = 1 ten 11 ones = 1 ten 1 one 18 ones = 1 ten 8 ones
Multiplication by a 1-Digit Number
Intro
10 ones = 1 ten ?
11 ones = 1 ten 1 one ?
18 ones = 1 ten 8 ones ?
53 ones = 5 tens 3 ones

6. Multiplication by a 1-Digit Number
Intro
How many ten?
1 ten

7. 10 tens = 1 hundred 10 tens How many tens?
Multiplication by a 1-Digit Number
Intro
How many tens?
10 tens
10 tens = 1 hundred

8. ? ? 10 tens = 1 hundred 20 tens = 2 hundreds 50 tens = 5 hundreds
Multiplication by a 1-Digit Number
Intro
10 tens = 1 hundred
20 tens = 2 hundreds ?
50 tens = 5 hundreds ?

9. ? 21 tens = 2 hundreds 1 ten 21 tens How many tens?
Multiplication by a 1-Digit Number
Intro
How many tens?
21 tens
21 tens = 2 hundreds 1 ten ?

10. ? ? ? 21 tens = 2 hundreds 1 ten 26 tens = 2 hundreds 6 tens
Multiplication by a 1-Digit Number
Intro
21 tens = 2 hundreds 1 ten ?
26 tens = 2 hundreds 6 tens ?
28 tens = 2 hundreds 8 tens
33 tens = 3 hundreds 3 tens ?

11. ? ? 3 hundreds 3 tens + 1 ten = 3 hundreds 4 tens
Multiplication by a 1-Digit Number
Intro
3 hundreds 3 tens + 1 ten =
3 hundreds 4 tens ?
3 hundreds 3 tens + 4 tens =
3 hundreds 7 tens ?

12. 6 X 1 = 6 6 X 2 = 12 6 X 5 = 30 ? ? 6 ones X 1 = 6 ones 6 ones X 2
Multiplication by a 1-Digit Number
Intro
6 ones X 1
= 6 ones
6 X 1 = 6
6 ones X 2
= 12 ones ?
6 X 2 = 12 ?
6 ones X 5
= 30 ones
6 X 5 = 30

13. Multiplication by a 1-Digit Number
Intro
2 tens X 1
= 2 tens
20 X 1 = 20
5 tens X 2
= 10 tens ?
50 X 2 = 100
6 tens X 5 ?
= 30 tens
60 X 5 = 300

14. Multiplication by a 1-Digit Number
Intro
5 hundreds X 1
= 5 hundreds
500 X 1 = 500 ?
5 hundreds X 2
= 10 hundreds
500 X 2 = 1000
3 hundreds X 2
= 6 hundreds ?
300 X 2 = 600
6 hundreds X 2
= 12 hundreds ?
600 X 2 = 1200

15. Multiplication by a 1-Digit Number
Intro
1 thousand X 1
= 1 thousand
1000 X 1 = 1000 ?
2 thousands X 2
= 4 thousands
2000 X 2 = 4000 ?
2 thousands X 6
= 12 thousands
2000 X 6 = 12000
8 thousands X 3
= 24 thousands ?
8000 X 3 = 24000

16. Multiplication by a 1-Digit Number
Intro
1 ten
= 10
= 1 X 10
= 10 X 1
2 tens ?
= 20
= 2 X 10
= 10 X 2
3 tens ?
= 30
= 3 X 10
= 10 X 3 ?
5 tens
= 50
= 5 X 10
= 10 X 5

17. ? ? 1 hundred = 100 = 1 X 100 = 100 X 1 5 hundreds = 500 = 5 X 100
Multiplication by a 1-Digit Number
Intro
1 hundred
= 100
= 1 X 100
= 100 X 1
5 hundreds ?
= 500
= 5 X 100
= 100 X 5
7 hundreds ?
= 700
= 7 X 100
= 100 X 7

18. ? ? 1 thousand = 1000 = 1 X 1000 = 1000 X 1 3 thousands = 3000
Multiplication by a 1-Digit Number
Intro
1 thousand
= 1000
= 1 X 1000
= 1000 X 1
3 thousands ?
= 3000
= 3 X 1000
= 1000 X 3
8 thousands ?
= 8000
= 8 X 1000
= 1000 X 8

19. 1 9 X 8 Multiplication by a 1-Digit Number Intro multiplicand
multiplier
product

20. 1 9 X 8 Th H T O O – Ones T – Tens H – Hundreds Th – Thousands
Multiplication by a 1-Digit Number Th H T O
Intro
O – Ones
T – Tens
H – Hundreds
Th – Thousands
1 9
X 8
The multiplicands have place values.

21. 1 9 X 8 Th H T O Th H T O O – Ones T – Tens H – Hundreds
Multiplication by a 1-Digit Number Th H T O
Intro
O – Ones
T – Tens
H – Hundreds
Th – Thousands
1 9
X 8
The product have place values. Th H T O

22. 1 9 X 8 1 5 2 7 Th H T O Th H T O 15 tens = 1 hundred 5 tens
Multiplication by a 1-Digit Number Th H T O
Example 1 7
Add 7 tens to 8 tens
1 9
X 8
9 ones X 8
Multiply 9 by 8 first
= 8 tens tens
= 72 ones
= 15 tens
= 7 tens 2 ones
1 5 2
Then multiply 1 by 8
1 ten X 8
15 tens = 1 hundred 5 tens
= 8 tens Th H T O
Review: 10 tens = 1 hundred

23. 1 9 X 8 1 5 2 7 Th H T O Th H T O Multiplication by a 1-Digit Number
Example 1
Summary 7
Add 80 and 70
1 9
X 8
= 150
9 X 8
= 72
1 5 2
10 X 8
= 80 Th H T O

24. Multiplication by a 1-Digit Number
Method Used in Grade 3 Th H T O
Example 1
1 9
X 8
9 ones X 8
Multiply 9 by 8 first
= 9 X 8
= 72 7 2
Then multiply 1 by 8
1 ten X 8
= 10 X 8 + 8
= 80
1 5 2

25. Multiplication by a 1-Digit Number
Method Used in Grade 3 Th H T O
Example 1
Summary
1 9
X 8 7 2
9 X 8 + 8
10 X 8
1 5 2

26. 6 5 X 3 1 9 5 1 Th H T O Th H T O 19 tens = 1 hundred 9 tens
Multiplication by a 1-Digit Number Th H T O
Example 2 1
Add 1 ten to tens
6 5
X 3
5 ones X 3
Multiply 5 by 3 first
= 18 tens ten
= 15 ones
= 19 tens
= 1 ten 5 ones
1 9 5
Then multiply 6 by 3
6 tens X 3
19 tens = 1 hundred 9 tens
= tens Th H T O
Review: 10 tens = 1 hundred

27. 6 5 X 3 1 9 5 1 Th H T O Th H T O Multiplication by a 1-Digit Number
Example 2
Summary 1
Add 180 and 10
6 5
X 3
5 X 3
= 190
= 15
1 9 5
60 X 3
= 180 Th H T O

28. Multiplication by a 1-Digit Number
Method Used in Grade 3 Th H T O
Example 2
6 5
X 3
5 ones X 3
Multiply 5 by 3 first
= 5 X 3
= 15 1 5
Then multiply 6 by 3
6 tens X 3
= 60 X 3
1 8 0 +
= 180
1 9 5

29. Multiplication by a 1-Digit Number
Method Used in Grade 3 Th H T O
Example 2
Summary
6 5
X 3 1 5
5 X 3
1 8 0 +
60 X 3
1 9 5

30. 6 1 3 9 X 9 5 1 3 8 Th H T O Th H T O 35 tens = 3 hundred 5 tens
Multiplication by a 1-Digit Number Th H T O
Example 3 3 8
Add 8 tens to tens
X 9
9 ones X 9
Multiply 9 by 9 first
= 27 tens tens
= 81 ones
= 35 tens
= 8 tens 1 one 5 1
Then multiply 3 by 9
3 tens X 9
35 tens = 3 hundred 5 tens
= tens Th H T O

31. 6 1 3 9 X 9 1 2 5 1 3 8 Th H T O Th H T O 12 hundreds =
Multiplication by a 1-Digit Number Th H T O
Example 3 1 3 8
Add 3 hundreds to 9 hundreds
X 9
1 hundred X 9
Multiply 1 by 9
= 9 hundreds hundreds
= 9 hundreds
= 12 hundreds 2 5 1
12 hundreds =
1 thousand 2 hundreds Th H T O
Review: 10 hundreds = 1 thousand

32. Multiplication by a 1-Digit NumberTh H T O
Example 3 1 3 8
Add 1 thousand to 54 thousands
X 9
1 hundred X 9
Multiply 1 by 9
= 54 thousands + 1 thousand
= 9 hundreds
= 55 thousands
5 5 2 5 1
Then multiply 6 by 9
6 thousands X 9
= thousands Th H T O

33. Multiplication by a 1-Digit NumberTh H T O
Example 3
Summary 3 8
Add 270 and 80
X 9
9 X 9
= 350
= 81 5 1
30 X 9
= 270 Th H T O

34. Multiplication by a 1-Digit NumberTh H T O
Example 3
Summary 1 3 8
Add 900 and 300
X 9
100 X 9
= 1200
= 900 2 5 1 Th H T O

35. Multiplication by a 1-Digit NumberTh H T O
Example 3
Summary 1 3 8
Add and 1000
X 9
100 X 9
= 55000
= 900
5 5 2 5 1
6000 X 9 = Th H T O

36. Multiplication by a 1-Digit Number
Method Used in Grade 3 Th H T O
Example 3
X 9
9 ones X 9
Multiply 9 by 9 first
= 9 X 9
= 81 8 1
Then multiply 3 by 9
3 tens X 9
= 30 X 9
2 7 0
= 270

37. Multiplication by a 1-Digit Number
Method Used in Grade 3 Th H T O
Example 3
X 9
1 hundred X 9
Multiply 1 by 9
= 100 X 9
= 900 8 1
Then multiply 6 by 9
6 thousands X 9
= 6000 X 9
2 7 0
= 54000
9 0 0 +

38. Multiplication by a 1-Digit Number
Method Used in Grade 3 Th H T O
Example 3
Summary
X 9 8 1
9 X 9
2 7 0
30 X 9
9 0 0
100 X 9 +
6000 X 9