I was using the mathworksheetsite for addition timed test. 20 Problems in one minute. We could practice all 0's (1,2,3,ect) with use of 0-10. I want to do the same for subtraction but the website for 0's (1,2,3) with the use of 0-10 will only print out 11 problems even though it states there will be 20 problems. Anyone know of anyother free Math websites that I could generate problems for timed test?