(10 + 1) x 10/2
1+2+3+4=10 The formula for adding consecutive numbers is n*(n+1)/2. This could be done easily as mental math, on paper or using a calculator.
30. 2+3+5=10, 4+6=10, and 2+4+1+1+2=10.
The original questions is in parenthesis,71 plus 2 = 10 22 plus 31 =8 111 plus 22 =7(71) 7+1 "plus" 2 (2) = 10, (22) 2+2 (plus) (31) 3+1=8, (111) 1+1+1 "plus" (22) 2+2=7
1 plus 1 x 2 plus 3 x 42 plus 10 x 5 = 1 + 2 + 126 + 50 = 179
2 1/5 + 1/4 + 1/4 = 2 7/10.
If you mean the sum of first n natural numbers then the formula is (n(n+1))/2 for example, 1+2+3+4+5=5*6/2=15
15 + 15 + (10 * (1 / 2)) + (10 * (1 / 2)) = 40
1 plus 1 is 2. Plus 1 is 3. Plus 1 is 4. Plus 10 is 14. 14.
It equals 10
3 + 5 + 6 + 9 + 2 + 1 + 10 = 36
2 decimal, or 10 binary.
10 + 2(x - 1) + 7 x 3x + 1 =10 + 2x - 2 + (7 x 3x) + 1 =10 + 2x - 2 + 21x + 1 =2x + 21x + 10 - 2 + 1 =23x + 9
1 plus 1 = 2
1 + 2 + 4 + ... + 2n = 2n+1 - 1
1/5 plus 1/2 is the same as 2/10 plus 5/10 = 7/10
It equals 28. ,
It's 1+1 and it equals 2 in decimal system