30
40+-30=10
4100
thinking is amazing
thirty plus 50 equals 80 it is quite simple. all you do is you just add 3 and 5 then add on the zero.
These may help you answer your questions: 1, 2, 4, 5, 8, 10, 20 and 40.
10 plus 20 plus 30plus 40 plus 50 equals 150 because 50 plus 40 equals 90 plus 30 =120+20= 140 then + 10 = 150
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