Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to buy a checkbook calculator [title] Measure the space in your checkbook for a calculator. [substeps] The calculator should fit inside the checkbook cover without impeding the closure of the checkbook cover. Checkbook calculators come in a variety of sizes.

Ending1: If you haven't used a checkbook all of the time, you probably don't need the calculator. If the size is larger than the width of your checkbook, however, it's probably not a good idea to purchase it. Ending2: If you use a larger calculator you may find you need 3 to 4 different sizes of calculator. Make sure the calculator you buy is compatible with your checkbook. Ending3: Generally, the most common size is 214 and the smaller an equation, the larger the calculator will be. [title] Before making your final calculation, list the amount of money you will need. Ending4: If possible, choose a checkbook calculator with latches. The latches hook onto the checkbook cover and helps to prevent the calculator from slipping out of the checkbook.

Answer format: ending1/ending2/ending3/ending4