place value and multiplication
DESCRIPTION
Place Value and Multiplication. Place Value & X by 10. 3 2 0. 7 8, 9 5 0. Place Value & X by 10. 2 3 4, 5 6 0. 8 9 0, 1 2 3, 4 5 0. Place Value & X by 10. 8 . 2. 1 0 . 3. When you multiply by ten. The answer gets bigger - PowerPoint PPT PresentationTRANSCRIPT
Place Value and Multiplication
millions thousands
100 10 1 100 10 1 100 10 1Before the
decimal point . After the decimal point
1000 100 10 1 . 1/101/100
1/10001/10000
Place Value & X by 10
millions thousands
100 10 1 100 10 1 100 10 1
3 2
7, 8 9 5
3 2 0
7 8, 9 5 0
Place Value & X by 10
millions thousands
100 10 1 100 10 1 100 10 1
2 3, 4 5 6
8 9, 0 1 2, 3 4 5
2 3 4, 5 6 0
8 9 0, 1 2 3, 4 5 0
Place Value & X by 10
thousands After the decimal point
100 10 1 100 10 1 . 1/10 1/100
0 . 8 2
1 . 0 3
8 . 2
1 0 . 3
When you multiply by ten
• The answer gets bigger
• The decimal point moves to the right one place or the numbers move one place to the left
4 6 . 5 9. 2 3 . 0
2 3 0 .
Multiply by 10 -
0.06 x 10 0.06 x 10 ==
4.209 x 10 4.209 x 10 ==
3.52 x 10 =3.52 x 10 =
0.0086 x 10 0.0086 x 10 ==
35.235.2
42.0942.09
0.60.6
0.0860.086
The answer gets bigger
Place Value & X by 100
millions thousands
100 10 1 100 10 1 100 10 1
3 2
7, 8 9 5
3, 2 0 0
7 8 9, 5 0 0
Place Value & X by 100
millions thousands
100 10 1 100 10 1 100 10 1
3, 4 5 6
9, 0 1 2, 3 4 5
3 4 5, 6 0 0
9 0 1, 2 3 4, 5 0 0
When you multiply by a hundred
• The answer gets bigger
• The decimal point moves to the right two places or the numbers move two places to the left
4 6 . 5 9 . 3 2 . 8
22 88 0
Multiply by 100• 6 x 100
• 12 x 100
• 25 x 100
• 64 x 1000.16 x 0.16 x 100100
4.23 x 1004.23 x 100
13.5 x 13.5 x 100100
0.063 x 0.063 x 100100
= 1200
= 600
= 2500
= 6400 = 6.3
= 1350
= 423
= 16
When you multiply by a thousand
• The answer gets bigger
• The decimal point moves to the right three places or the numbers move three places to the left
4 6. 5 9 . 32 . 3 5
222 333 555 0
Multiply by 1000 • 6 x 1000
• 12 x 1000
• 25 x 1000
• 64 x 10000.16 x 0.16 x 10001000
4.23 x 4.23 x 10001000
13.5 x 13.5 x 10001000
0.063 x 0.063 x 10001000
= 12,000
= 6,000
= 25,000
= 64,000 = 63
= 13,500
= 4,230= 160
When multiplying by 10,100,1000-• I know that the number gets bigger
• The place value of each digit is changing
or
the decimal point is moving
Can I do this multiply by just looking at it?101011 =10 =10 101022 =10 x 10 =100 =10 x 10 =100101033 =10 x 10 x 10 =1000 =10 x 10 x 10 =1000101044 = 10 x 10 x 10 x 10=10000 = 10 x 10 x 10 x 10=10000