Answer:
9.) 56
10.) 40+14=54 and 54 would be your final answer.
Explanation:
9.)add the 18 and the 12 you get 30, then add the 16 and 11 and you get 27, add 30+27=57
10.)there are two 10's in 21 and one 1
there is one 10 in 15 and five 1's
there is one 10 in 18 and eight 1's
add your tens first then your ones. (10+10+10+10=40) (8+5+1=14)
