Sliding Decimal Points

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Presentation transcript:

Sliding Decimal Points Lesson # 14 Sliding Decimal Points

When we divide a number by 10… The decimal point slides One place To the Left Watch…

123 ÷ 10 = ? 12.3 Right!

So when dividing by 100… The decimal point Slides Two places To the Left Watch…

123 ÷ 100 = 1.23

Similar rules apply When Multiplying By 10 Or 100

The only difference… Opposite (right) The decimal point Slides In The Direction Watch…

123 x 10 = ? 1230

123 x 100 = ? 12 300

Got it ? I hope so, Because Here come 10 Practice questions…

Ready? Set… Go !

Question # 1 324 ÷ 10 = ?

Question # 2 56 x 100 = ?

Question # 3 78.9 x 10 = ?

Question # 4 12.34 ÷ 10 = ?

Question # 5 3.456 X 100 = ?

Question # 6 7.89 ÷ 10 = ?

Question # 7 912.3 X 100 = ?

Question # 8 0.456 ÷ 10 = ?

Question # 9 0.78 ÷ 100 = ?

Question # 10 0.925 x 100 = ?

And now for the answers… Get Ready

Question # 1 324 ÷ 10 = 32.4

Question # 2 56 x 100 = 5600

Question # 3 78.9 x 10 = 789

Question # 4 12.34 ÷ 10 = 1.234

Question # 5 3.456 X 100 = 345.6

Question # 6 7.89 ÷ 10 = 0.789

Question # 7 912.3 X 100 = 91 230

Question # 8 0.456 ÷ 10 = 0.0456

Question # 9 0.78 ÷ 100 = 0.0078

Question # 10 0.925 X 100 = 92.5

The End

Of course… Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice Practice