I understand that 4 times 6 tens is 240. I am now being asked to add the extra tens to 240. how do I do that? are the extra tens 40. so if I add 240+40=280 is that the answer?
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Yes, you have $4\cdot 60+40=240+40=280$ – Peter Jul 02 '16 at 10:08
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You can also calculate $4\cdot 6\cdot 10+4\cdot 10=(4\cdot 6+4)\cdot 10=28\cdot 10=280$ – Peter Jul 02 '16 at 10:09