286
The total is 400.
1000+40=1040 1040+1000=2040 2040+30=2070 2070+1000=3070 3070+20=3090 3090+1000=4000 4000+10=4100
40 (+20, -10, +30 ,-20)
Because you're simply adding everything together !.. 1000+40 = 1040 1000+30 = 1030 1000+20 = 1020 and 1000+10 = 1010... Add everything together and you get... 4000+40+30+20+10 which is 4100 !
50 + 40 + 40 + 40 + 30 + 30 + 20 + 10 = 260
These may help you answer your questions: 1, 2, 4, 5, 8, 10, 20 and 40.
286
30 + (30-10) = 50
30
The total is 400.
1000+40=1040 1040+1000=2040 2040+30=2070 2070+1000=3070 3070+20=3090 3090+1000=4000 4000+10=4100
|-20 - (-40)| = 20 |-20 - 10| = 30 -20 is closer to -40 than 10.
9/10 + 3/4 = 36/40 + 30/40 = 66/40 = 33/20 or 1 13/20
40 (+20, -10, +30 ,-20)
40+-30=10
4100