Balance Subtraction Equations up to Three Digits (Within 1000)

Consider the subtraction equation:

290 – 53 = 370 – ___

Let's identify the missing number to complete this equation.

To find the missing number,
 

first, we need to calculate 290 – 53.
 

290 – 53    =     370 – ?
 

237            =     370 – ?
 

Now, to find the missing number we need to calculate 370 – 237.
 

Subtract:
 

370 – 237 = 133
 

The missing number is 133.