Ok so it is really easy but ill explain how and why
You round any thing 5 or more up to the next digit and anything 4 or less round to the same just add 0's instead so take 56+34 56 rounds to 50 and 34 rounds to 30 so 50+30=80
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It is easier to simply add two one-digit numbers than to mess about with estimation!
they all are digit numbers
From right to left.
To make the list of two-digit numbers with digits that add up to 10, first write the pairs of single-digit integers that add up to 10. They are (1,9), (2,8), (3,7), (4,6), (5,5). Then recognize that each of these pairs of numbers, except 5, can be combined in two different ways to make two-digit numbers that satisfy the problem. 19 and 91 28 and 82 37 and 73 46 and 64 55 So there are nine two-digit numbers with digits that add up to 10.
No.