2-3: Use Models to Add and Subtract Decimals: Quick Check

A The sum is less than one because both decimals are less than one.

B The sum is less than one because the sum does not completely shade one hundredths grid.

C The sum is greater than one because the sum shades more than one hundredths grid.

D The sum is greater than one because any two decimals to the hundredths added together is greater than one.

A 0.92 – 0.19 = 0.73

B 0.73 + 0.19 = 0.92

C 1.00 – 0.19 = 0.81

D 1.00 + 0.73 = 1.73

A Count 40 shaded squares, or 0.40, on the first grid and 80 shaded squares, or 0.80, on the second grid. Then add them together to get 1.20.

B Count 44 shaded squares, or 0.44, on the first grid and 87 shaded squares, or 0.87, on the second grid. Then add them together to get 1.31.

C Count 56 shaded squares, or 0.56, on the first grid and 13 shaded squares, or 0.13, on the second grid. Then add them together to get 0.69.

D Count a total of 100 squares, or 1.00, on the left grid and 100 squares, or 1.00, on the right grid. Then add them together to get 2.00.