Maths

W.A.L.T solve addition problems by going back through the tens.
54-7=48 (54-4=50--3=47)
65-8=57 (65-5=60-3=57)
72-9=63 (72-2=70-7=63)
83-8=75
132-7=125
211-8=203
393-6=387

I solved these problems by going to the tidy tens.