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The formula from page 46 to page 54 of the math oral card in the second volume of the fourth grade.
1.2+9= 10.2

5.43-3.06=2.37

3+ 1.2=4.2

0. 12+5=5. 12

1.2+ 1.8+ 1.4=4.4

6.2+ 16+3.8=26

14-0.6= 13.4

20.3-8= 12.3

50- 1.5+4= 53.5

175-0.56= 174.44

2.08+ 1 1= 13.089

0.4+20= 20.4

2.5+67+7.5=77

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