400 x 80 = 4 x 100 x 8 x 10 = 4 x 8 x 1000 = 32000
400 multiplied by 80 equals 32,000.
400 multiplied by 8 is 3,200
80 multiplied by 15 is 1200.
88,400,000,000
79 multiplied by 400 is 31,600.
400 multiplied by 19 is 7,600.
40
I suggest 80 * 410 = 80 * 400 + 80 * 10 = 32000 + 800 = 32800.
400 multiplied by 20 is 8,000
400 multiplied by 8 is 3,200
80 multiplied by 15 is 1200.
88,400,000,000
20000 + 6000 + 400 + 80 + 920000 + 6000 + 400 + 80 + 920000 + 6000 + 400 + 80 + 920000 + 6000 + 400 + 80 + 9
90,000 multiplied by 400 is 36,000,000.
2,400 multiplied by 400 is 960,000.
150 multiplied by 400 is 60,000.
400 multiplied by 3.14 is 1,256
79 multiplied by 400 is 31,600.