1. Round each number to the nearest ten. Estimate the difference. A. 40 B. 20 C. 30 D. 10 Hint 2. Round each number to the nearest ten. Estimate the difference. A. 10 B. 20 C. 30 D. 40 Hint 3. How many tens are in 50? A. 5 B. 4 C. 6 D. 7 Hint 4. How many tens are in 20? A. 4 B. 2 C. 1 D. 3 Hint 5. Find the difference.6 tens − 4 tens = ___ tens A. 1 B. 0 C. 2 D. 3 Hint 6. Find the difference.40 − 10 = ___ A. 30 B. 10 C. 20 D. 0 Hint 7. Find the difference.28 − 3 = ___ A. 24 B. 23 C. 25 D. 31 Hint 8. Find the difference.53 − 20 = ___ A. 13 B. 33 C. 43 D. 23 Hint 9. Find the difference.36 − 1 = ___ A. 33 B. 34 C. 37 D. 35 Hint 10. Find the difference.31 − 4 = ___ A. 30 B. 28 C. 25 D. 27 Hint 11. Find the difference. A. 22 B. 25 C. 23 D. 24 Hint 12. Find the difference. A. 68 B. 65 C. 67 D. 66 Hint 13. Find the difference. A. 22 B. 18 C. 20 D. 28 Hint 14. Find the difference. A. 70 B. 82 C. 79 D. 80 Hint 15. Which addition problem checks the subtraction problem? A. B. C. D. Hint 16. Which addition problem checks the subtraction problem? A. B. C. D. Hint