In order to add or subtract decimal numbers, each number needs to have the same number of digits behind the decimal point. If you write the problem vertically, you can avoid the common problem of adding the numbers incorrectly. For instance, 1.2 + 3.41 is not 4.43. The ‘‘2’’ needs to be added to the ‘‘4’’, not to the ‘‘1’’.
1.20 (Add as many zeros at the end as
you need.)
+4.43
5.63
510.3 –
422.887 becomes 510.300
– 422.887
87.413
Practice
Rewrite as a vertical problem and solve.
1.
7.26 + 18.1
2.
5 – 2.76
3.
0.446 + 1.2
Solutions
1.
7.26 + 18.1
7.26
+ 18.10
25.36
2.
5 – 2.76
5.00
– 2.76
2.24
3.
0.446 + 1.2
0.446
+ 1.200
1.646
Sumber
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