Addition And subtraction

1.63+72=135  because 3+2=5 and 60+70=130

2.56+49=105 because 6+9=15 and 50+40=90

3.116+215=321 because 1+2=3 and 16+15=31

4.369+451=920 because 4+3=7 and 69+51=110

5.934+64=998 because 3+4=7 and 6+34=40

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