First we can break down the numbers by place value: 37 = 30 + 7 and 28 = 20 + 8. Then we can add by place value. First the tens: 30 + 20 = 50, then the ones: 7 + 8 = 15. Now we have 50 + 15, but we need to regroup 15 as 1 ten and 5 ones: 50 + 10 + 5 = 65. So, 37 + 28 = 65.