Explanation:
Rules of rounding off:
1.) If the digit following the last digit to be kept is less than five, the last digit is left unchanged.
2.) If the digit following the last digit to be kept is five or more, the last digit to be kept is increased by one.
A. 37.63 times 0.54
37.63 × 0.54 = 20.3202
20.3202 ≈ 20.3
B. 54.49 times 0.45
54.49 × 0.45 = 24.5205
24.5205 ≈ 24.5
C. 1.19 times 1.45
1.19 × 1.45 = 1.7255
1.7255 ≈ 1.7
D. 0.81 times 8.01
0.81 × 8.01 = 6.4881
6.4881 ≈ 6.5
E. 27.83 times 13.64
27.83 × 13.64 = 379.6012
379.6012 ≈ 379.6