Please help me I neeeeeddddddd heeeeeeellllllllpppppppp

Answer:
1. 843 x 61 = 51,423
473 x 38 = 17974
2. (1,3), (2,6), (3,9), (4,12)
3. do it on your own
4. 6.478, 6.503, 6.5, 6.6
5. do it on your own
you should know this bro its simple