Bigger or Smaller?

Without calculating, which gives you the smaller product, 0.54 x 4 or
0.55 x 4? Also without calculating, how much smaller is the product?

Without calculating, which gives the smaller product, 0.54 x 0.4 or
0.55 x 0.4? Also without calculating, how much smaller is the product?

(Source: Adapted from Van de Walle and Lovin, 2006)