Find the missing number.
700000 + 50000 + 2000 + 70 = 100000 + _________.

652,070

We are given the equation:

700,000 + 50,000 + 2,000 + 70 = 100,000 + _________

Our goal is to determine the missing number that, when added to 100,000, equals the sum of the numbers on the left-hand side.

Step-by-Step Solution

Calculate the sum of the numbers on the left-hand side:

700,000 + 50,000 + 2,000 + 70 = 752,070

Adding these values together gives us 752,070.

Set up the equation to find the missing number:

100,000 + A = 752,070

Here, A represents the missing number.

Isolate A by subtracting 100,000 from both sides:

A = 752,070 - 100,000

Subtracting 100,000 from 752,070 gives us 652,070.

Conclusion:

A = 652,070

Therefore, the missing number is 652,070.

Conceptual Understanding

This problem involves basic arithmetic operations—addition and subtraction—to balance an equation. By calculating the total of the numbers on one side and then determining the value needed on the other side to achieve equality, we can solve for the unknown variable.