Practice find each product mentally using the distributive property. 4 * 48=

4 * (48) = 4 * (40+8) = 4*40 + 4*8 = 160 + 32 = 192

You can think of it as having four copies of 40 added to four copies of 8 which ultimately leads to 160+32 = 192

Alternatively,

4 * (48) = 4 * (50-2) = 4*50 - 4*2 = 200 - 8 = 192

which may be a shorter route