To solve "calculate", all you need to know is simple arithmetic. Move from clue to clue as sometimes you may not be able to enter an entire number but other clues and some logic will help. To help you get started, the answer to 1 Across has been entered.

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	ACROSS		DOWN
1.	2 down plus 46 across	1.	Last digit is the total of the first and second digits
2.	Consecutive digits in order	2.	Six squared
6.	29 across reversed plus 14 down	3.	Middle digit is the sum of the other two digits
8.	First three digits of 45 across in different order	4.	7 down minus 25 across
9.	39 down plus four hundred	5.	29 across plus 1 across
11.	7 down plus 24 down	7.	First three digits of 45 across
13.	Eight cubed plus two	8.	33 across plus six
15.	37 down plus 44 across	10.	16 down times two
17.	36 down plus one hundred	12.	9 across plus 10 down, minus one
19.	First three digits of 2 across minus 20 across	14.	Two times seven
20.	29 across minus one	16.	37 down minus 39 down
21.	Same as 5 down	18.	Its digits total thirty five
22.	32 down minus 6 across	19.	One hundred ninety two squared, minus 20 across
23.	21 across divided by six	20.	10 down plus forty
25.	5 down reversed	24.	39 down plus 21 across
27.	2 down plus 25 across	26.	20 across times 43 down
28.	Last two digits of 39 down times two	29.	29 across times ten
29.	1 across divided by two	31.	1 down plus 29 down
30.	Its digits total nineteen	32.	Nine squared plus one
33.	Twelve squared	34.	29 down times two
35.	12 down plus 41 down	35.	Same digits of 7 down in different order
36.	36 down plus 14 down	36.	3 down plus 14 down
38.	Last three digits of 18 down minus 27 across	37.	Seven cubed
40.	34 down times two	39.	Same digit three times
42.	1 across minus five, times ten	41.	28 across plus last two digits of 19 across
44.	28 across plus 29 across	43.	1 across minus 14 down
45.	2 across times two
46.	2 down minus 29 across