Answer:
Hi:) Do you have a specific question on something or just some tips for those desired good grades?
Step-by-step explanation:
When you do the multiplication you can notice that 10, 20, 30, 40 all have 0's at the end.
So that means 10 *20*30*40 = 1*2*3*4*10000 = 24*10000 = 240,000
You can add a lot of numbers (or so I think). One number I think you can add is 31.
Can you post the scale drawing please so I can help you
