1
$2.5 + 0.9 =$ $0.3 + 4.2 =$ $9.5 - 8.7 =$
$1.8 + 0.8 =$ $4.5 + 3.9 =$ $1.1 - 0.3 =$
$2.4 + 0.7 =$ $5.3 + 3.4 =$ $7.2 - 3.9 =$
$1.1 + 0.9 =$ $1.3 + 8.4 =$ $3.6 - 1.8 =$
$2.4 + 4.8 =$ $0.45 + 0.27 =$ $10.5 - 2 =$
$6.7 + 0.42 =$ $0.51 + 0.49 =$ $0.89 - 0.51 =$
$0.15 + 0.32 =$ $1.7 - 1.5 =$ $1.7 - 0.8 =$
$1.7 + 4.9 =$ $2.1 - 0.7 =$ $7.9 + 2.5 =$
$6.7 + 3.7 =$ $4.3 - 2.8 =$ $8.1 - 4.5 =$

1. $2.5 + 0.9 = 3.4$
2. $0.3 + 4.2 = 4.5$
3. $9.5 - 8.7 = 0.8$
4. $1.8 + 0.8 = 2.6$
5. $4.5 + 3.9 = 8.4$
6. $1.1 - 0.3 = 0.8$
7. $2.4 + 0.7 = 3.1$
8. $5.3 + 3.4 = 8.7$
9. $7.2 - 3.9 = 3.3$
10. $1.1 + 0.9 = 2.0$
11. $1.3 + 8.4 = 9.7$
12. $3.6 - 1.8 = 1.8$
13. $2.4 + 4.8 = 7.2$
14. $0.45 + 0.27 = 0.72$
15. $10.5 - 2 = 8.5$
16. $6.7 + 0.42 = 7.12$
17. $0.51 + 0.49 = 1.00$
18. $0.89 - 0.51 = 0.38$
19. $0.15 + 0.32 = 0.47$
20. $1.7 - 1.5 = 0.2$
21. $1.7 - 0.8 = 0.9$
22. $1.7 + 4.9 = 6.6$
23. $2.1 - 0.7 = 1.4$
24. $7.9 + 2.5 = 10.4$
25. $6.7 + 3.7 = 10.4$
26. $4.3 - 2.8 = 1.5$
27. $8.1 - 4.5 = 3.6$

列算式

$□ + □ = 5.5$ $□ - □ = 0.3$
$□ - □ = 0.8$ $□ + □ = 11.1$
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答案略