Lesson #5 Bridging Decimals.

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Presentation transcript:

Lesson #5 Bridging Decimals

Try adding in your head… 1.8 + 2.3 + 4.7 + 2.4 Like bridging whole numbers, decimals can also be bridged from one another. Try adding in your head… 1.8 + 2.3 + 4.7 + 2.4

1.8 + 2.3 + 4.7 + 2.4 = ? Think … 1.8 + 2.0(of the 2.3) = 3.8 then 3.8 + 0.3(of the 2.3) = 4.1 then 4.1 + 4.0 (of the 4.7) = 8.1 then 8.1 + 0.7 (of the 4.7) = 8.8 then 8.8 + 2.0 (of the 2.4) = 10.8 And finally 10.8 + 0.4(of the 2.4) = 11.2

Confused ? Well, what you do is … add the whole number first, then…. the decimal portions next.

Let’s look at another example… In your head, Add 5.23 + 2.56 + 1.35

5.23 + 2.56 + 1.35 = ? Think 5.23 + 2.00(of the 2.56) = 7.23 then 7.23 + 0.50(of the 2.56) = 7.73 then 7.73 + 0.06(of the 2.56) = 7.79 then 7.79 + 1.00(of the 1.35) = 8.79 then 8.79 + 0.30(of the 1.35) = 9.09 And finally 9.09 + 0.05(of the 1.35) = 9.14

And now 10 questions to practice. Get ready to write down ONLY the answers…

Question # 1 2.5 + 2.8 = ?

Question # 2 1.5 + 2.6 + 3.7 = ?

Question # 3 1.8 + 1.5 + 2.3 = ?

Question # 4 0.25 + 0.28 + 0.23 = ?

Question # 5 0.75 + 0.35 = ?

Question # 6 1.28 + 1.25 = ?

Question # 7 1.55 + 1.13 + 1.26 = ?

Question # 8 0.55 + 0.25 + 1.50 = ?

Question # 9 2.50 + 2.55 + 2.35 = ?

Question # 10 10.25 + 10.35 + 5.40 = ?

And now the answers… Good Luck !

Question # 1 2.5 + 2.8 = 5.3

Question # 2 1.5 + 2.6 + 3.7 = 7.8

Question # 3 1.8 + 1.5 + 2.3 = 5.6

Question # 4 0.25 + 0.28 + 0.23 = 0.76

Question # 5 0.75 + 0.35 = 1.10

Question # 6 1.28 + 1.25 = 2.53

Question # 7 1.55 + 1.13 + 1.26 = 3.94

Question # 8 0.55 + 0.25 + 1.50 = 2.30

Question # 9 2.50 + 2.55 + 2.35 = 7.40

Question # 10 10.25 + 10.35 + 5.40 = 26

The End