Subtraction+Strategies


 * Break the second number into tens and ones: to solve 35 - 12, break the 12 = 10 + 2. 35 - 10 = 25, 25 - 2 = 23
 * Subtract tens and ones: 30 - 10 = 20, 5 - 2 = 3, 20 + 3 = 23
 * Take jumps on the number line (backward or forward) using landmark numbers: to solve 45 - 20, count up from 20. 20 + 10 = 30, 30 + 10 = 4-, 40 + 5 = 45. 10 + 10 + 5 = 25