Configure your exercise::
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1..101..201..10050..500100..1000
+
+
−
−
×
×
÷
÷

also mul/div numbers bigger than 10
a + b = ?a + ? = c(a + b) • c = ?
use parentheses ()
...
system:decimalsroman numbershexadecimal
digits:1234
comma:123 digits
round up:10100
negative numbers
crossing the tens barrier (+ & -)
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