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Calculate in your mind
ADDITION
number of summands max digits in summands
select number of summands
2
3
4
5
10
select length of summands
1
2
3
4
5
+
+/-
???????
=
MULTIPLICATION
digits in the first operand digits in the second operand
select
1
2
3
4
select
1
2
3
4
?? * ??
=