We used two different types of spreadsheets, one being in Numbers and the other being on google drive.
On Numbers and Google Drive you can create a spreadsheet for almost anything. Have something for math that you need to type up, you can use a spreadsheet. If you have to add a bunch of numbers together, you can easly do that by inputting a formula. To do so you have to tap the cell that you want the numbers added to go, enter an equals sign, tap all the cells that you want to add in that row or column. If you have more rows that you need to find the sum, a simple and fast way to add all of them up, tap on the first cell that has all the added cells for that row and tap/click fill and drag down. It will take the formula that you used for the first cell you did and figure out the rest of the cells.
There are tons of formulas that you can use on a spreadsheet, like finding the average, multiplication, subtraction, division, and plenty more. Formulas are a great tool for getting the work done faster.