1. 1 1/4 + 1 3/4 = p (purple paint)
estimate : 1 + 2 = 3
actual answer : 1 1/4 + 1 3/4 = 3 gallons
2. 4 - 1 1/2 = r (ribbon left over)
estimate : 4 - 2 = 2
actual answer : 4 - 1 1/2 = 2.5 ft
3. 1 2/3 + 1 2/3 = c (cups of shredded cheese)
estimate : 2 + 2 = 4
actual answer : 1 2/3 + 1 2/3 = 2 4/3 = 3 1/3 cups