The multiplication fact 1 x 85 = 85 with 1 and 85 adds to 86;
The multiplication fact 2 x 84 = 168 with 2 and 84 adds to- 86;
etc.
But I don't quite think that is what you mean; I think you mean what are the factor pairs of 86:
1 x 86 & 2 x 43.
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You need to line up decimals for additional and subtraction. For multiplication, you don't need to line them up - in fact, it would serve no useful purpose.
20
5
Assuming that "adds up to" means "its digits add up to" 888
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