Subtract till 400

Calculate:

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

279	-	126	=
296	-	8	=
148	-	41	=
128	-	44	=
195	-	102	=
349	-	138	=
148	-	134	=
302	-	172	=
353	-	122	=
255	-	66	=