-30+(-47)
-30 + (-47) = -77
To solve the expression -30 + (-47):
1. Start by calculating the sum of -30 and -47:
-30 + (-47) = -77
Therefore, the result of -30 + (-47) is -77.
To solve the expression -30 + (-47), we need to remember a few rules of addition and multiplication.
First, let's focus on the parentheses around -47. The negative sign in front of 47 indicates that we have to change the sign of the number. So -(-47) becomes +47.
Now we have -30 + 47. To add these two numbers, we line them up vertically so that the place value columns line up correctly:
-30
+ 47
______
Next, we start with the rightmost column (the ones place). Subtract 0 from 7, which equals 7. Write down 7 below the line.
-30
+ 47
______
7
Now we move to the next column (the tens place). We need to subtract 3 from 4, but 4 is already smaller than 3. In this case, we can borrow from the hundreds place. So we cross out the 4 and replace it with 3, and add a 1 next to the 3 in the hundreds place. Therefore, 4 becomes 14, and we can subtract 3 from 14, which equals 11. Write down 11 below the line.
-30
+ 47
______
11
In the final step, since the tens place is negative (from -30), we'll put a minus sign in front of 11. Therefore, the answer is -11.
So, -30 + (-47) equals -11.