Maths

W.A.L.T.....Solve proplems like 34+_=97

Here are some of my problems

18+36=54

18 +2=20

20+30=50

50+4=54

2+30+4=

27+35=62

27+3=30

30+30=60

60+2=62

3+30+2=35

19+77=96

19+1=20

20+70=90

90+6=96

1+70+6=77

I solve these problems by rounding to the tidiest ten