Example : 30-12=18 Thirty take away twelve is eighteen. 23-13=? 28-20=? 25-11=? 29-9=? 27-13=? 24-15=? 22-12=? 21-10=? 26-23 = ?

23-13=10 Twenty-three take away thirteen is ten.

28-20=8 Twenty-eight take away twenty is eight.

25-11=14 Twenty-five take away eleven is fourteen.

29-9=20 Twenty-nine take away nine is twenty.

27-13=14 Twenty-seven take away thirteen is fourteen.

24-15=9 Twenty-four take away fifteen is nine.

22-12=10 Twenty-two take away twelve is ten.

21-10=11 Twenty-one take away ten is eleven.

26-23=3 Twenty-six take away twenty-three is three.