The closest estimate is the exact answer. For any other estimate, you can always get closer.
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The closest estimate is the exact answer. For any other estimate, you can do better with more effort.150*83 = approx 100*3/2*82 = 100*3*41 = 100*3*40 = 12000.
53
The answer would be 70. It would be seventy because estimate 2,130 divided by 33 is closest to 2,100 and 30 7 times 3= 21 so to get thusand 30 times 70
How about: 83+5 = 88 and 59+29 = 88 as two examples
All the prime numbers from 1 to 83 are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, and 83.