OK, let's crack this. We're given 240 and our task is to multiply it by 23. Essentially, we'll be adding 240 to itself 23 times.
Step 1: 0 + 240 = 240
Step 2: 240 + 240 = 480
Step 3: 480 + 240 = 720
Step 4: 720 + 240 = 960
Step 5: 960 + 240 = 1200
Step 6: 1200 + 240 = 1440
Step 7: 1440 + 240 = 1680
Step 8: 1680 + 240 = 1920
Step 9: 1920 + 240 = 2160
Step 10: 2160 + 240 = 2400
Step 11: 2400 + 240 = 2640
Step 12: 2640 + 240 = 2880
Step 13: 2880 + 240 = 3120
Step 14: 3120 + 240 = 3360
Step 15: 3360 + 240 = 3600
Step 16: 3600 + 240 = 3840
Step 17: 3840 + 240 = 4080
Step 18: 4080 + 240 = 4320
Step 19: 4320 + 240 = 4560
Step 20: 4560 + 240 = 4800
Step 21: 4800 + 240 = 5040
Step 22: 5040 + 240 = 5280
Step 23: 5280 + 240 = 5520

So, 240*23 = 5520