97-16

81

Quick methods:

• 97 − 16 = (100 − 3) − 16 = 100 − 19 = 81
• or (97 − 10) − 6 = 87 − 6 = 81

If you meant something else by "97-16" (e.g., 9^7 − 16 or a base-N subtraction), tell me and I’ll adjust. Want a quick set of similar problems for practice?