20
Zwanzig. - German
Van. - French
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10 + 10 = 20
or
10
+10
=20 Add column by column starting from the right hand column.
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Twenty ( English)
Vingt (French)
Zwanzig ( German).
10 + 10 + 10 + 10 + 10 + 10 + 10 + 108 = 178
One method is (10×4)+(5×3) = 55 (or mentally add up from left to right).
9 + 9 + 10 + 10 = 38
10 + 10 + 10
16 plus 10 plus 8 plus 6 plus 2 is equal to 42.