Question: How many additional blocks to make the cube whole? or How many cubes are missing to build a full cube
Answer: So, it’s a “cube” that’s 5 x 5 x 4
100 blocks total.
Bottom row 5 x 4 =20
Next row 4 x 4 =16
Next row 3 x 4 =12
Next row 2 x 4 =8
Top row 2 x 4 =8
Total 64
Missing 100 – 64 = 36
To make a perfect 5 x 5 x 5 cube, add one more row
5 x 5 =25
25 + 36 = 61