Derek has 50 inches of balsa wood. he used 36 7/8 inches to make a kite. he used 12 3/8 inches to make a model airplane. how much of the balsa wood is left?

3/4 balsa wood left

Step-by-step explanation:

36 7/8+12 3/8

48 10/8

49 1/4

50-49 1/4

3/4

Hello from MrBillDoesMath!

3/4 inch

Discussion:

Total balsa wood = 50 inches

Remaining balsa wood =  

Total balsa wood - 36 7/8 - 12 3/8 =

50 - 36 7/8 - 12 3/8 =

50 - (36 7/8 + 12 3/8) =                       => as 7/8  + 3/8 = 10/8 = 1 1/4

50 - ( 48 + 1 1/4)  =                

(50 - 48) -  1 1/4 =

2 - 1 1/4 =

3/4 inch

BTW: hard to believe that much wood remains  as wood is usually lost in the cutting process!

Thank you,

MrB