Oh, dude, you're hitting me with the math questions right off the bat? Okay, okay, let me break out my calculator... So, 5600 divided by 80 is 70. There you go, math wizardry at its finest.
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5600
There are 4 significant digits in 5600.
2
5600 - 400 = 5200 So 520 tens must be added.
A reasonable estimate for 83*69 is 80*70 = 5600.The true figure, for comparison, is 5727.