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

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

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

? ? 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

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

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

? ? 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 ?

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

? ? 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

? ? 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 ?

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

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

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

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

Multiplication by a 1-Digit Number Intro ? 6 ones X 1 = 6 ones 6 X 1 = 6 ? 6 ones X 6 = 36 ones ? 6 X 6 = 36 ? 72 ones = 72 86 ones = 86 ? ?

Multiplication by a 1-Digit Number Intro ? 2 tens X 1 = 2 tens 20 X 1 = 20 ? 5 tens X 3 = 15 tens ? 50 X 3 = 150 ? 9 tens = 90 21 tens = 210 ? ?

Multiplication by a 1-Digit Number Intro ? 5 hundreds X 1 = 5 hundreds 500 X 1 = 500 ? ? 5 hundreds X 4 = 20 hundreds 500 X 4 = 2000 ? 8 hundreds = 800 48 hundreds = 4800 ? ?

Multiplication by a 1-Digit Number Intro ? 1 thousand X 1 = 1 thousand 1000 X 1 = 1000 ? ? 2 thousands X 7 = 14 thousands 2000 X 7 = 14 000 ? 7 thousands = 7 000 56 thousands = 56 000 ? ?

? ? 1 ten = 10 = 1 X 10 = 10 X 1 2 tens = 20 = 2 X 10 = 10 X 2 3 tens 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

? ? 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

? ? 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

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

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

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

1 9 X 8 1 5 2 7 Th H T O Th H T O Multiplication by a 1-Digit Number Example 1 Th H T O 7 Add 7 tens to 8 tens 1 9 X 8 9 ones X 8 Multiply 9 by 8 first = 8 tens + 7 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

Multiplication by a 1-Digit Number Example 1 Summary Th H T O 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

1 9 X 8 2 + 1 5 2 7 8 Alternative Method Th H T O Multiplication by a 1-Digit Number Example 1 Alternative Method Th H T O 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

1 9 X 8 2 + 1 5 2 7 8 9 X 8 10 X 8 Alternative Method Th H T O Summary Multiplication by a 1-Digit Number Example 1 Alternative Method Th H T O Summary 1 9 X 8 7 2 9 X 8 + 8 10 X 8 1 5 2

6 5 X 3 1 9 5 1 Th H T O Th H T O Multiplication by a 1-Digit Number Example 2 Th H T O 1 Add 1 ten to 18 tens 6 5 X 3 5 ones X 3 Multiply 5 by 3 first = 18 tens + 1 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 = 18 tens Th H T O

Multiplication by a 1-Digit Number Example 2 Th H T O 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

6 5 X 3 5 1 8 0 + 1 9 5 1 Alternative Method Th H T O Multiplication by a 1-Digit Number Example 2 Alternative Method Th H T O 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

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

Multiplication by a 1-Digit Number Th H T O Example 3 3 8 Add 8 tens to 27 tens 6 1 3 9 X 9 9 ones X 9 Multiply 9 by 9 first = 27 tens + 8 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 = 27 tens Th H T O

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

Multiplication by a 1-Digit Number Th H T O Example 3 1 3 8 Add 1 thousand to 54 thousands 6 1 3 9 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 = 54 thousands Th H T O

Multiplication by a 1-Digit Number Th H T O Example 3 Summary 3 8 Add 270 and 80 6 1 3 9 X 9 9 X 9 = 350 = 81 5 1 30 X 9 = 270 Th H T O

Multiplication by a 1-Digit Number Th H T O Example 3 Summary 1 3 8 Add 900 and 300 6 1 3 9 X 9 100 X 9 = 1200 = 900 2 5 1 Th H T O

Multiplication by a 1-Digit Number Th H T O Example 3 Summary 1 3 8 Add 54000 and 1000 6 1 3 9 X 9 100 X 9 = 55000 = 900 5 5 2 5 1 6000 X 9 = 54000 Th H T O

6 1 3 9 X 9 1 2 7 0 8 Th H T O Alternative Method Multiplication by a 1-Digit Number Th H T O Example 3 Alternative Method 6 1 3 9 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

Multiplication by a 1-Digit Number Th H T O Example 3 Alternative Method 6 1 3 9 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 + 54 0 0 0 55 2 5 1

Multiplication by a 1-Digit Number Alternative Method Th H T O Example 3 Summary 6 1 3 9 X 9 8 1 9 X 9 2 7 0 30 X 9 9 0 0 100 X 9 + 54 0 0 0 6000 X 9 55 2 5 1