Subtract till 400

Calculate:

The number of examples:
Numerical difficulty:
Range of values:
Multiplicity:

124	-	19	=
116	-	70	=
229	-	64	=
257	-	178	=
267	-	155	=
253	-	62	=
185	-	8	=
288	-	161	=
183	-	34	=
224	-	41	=