Subtract Multiples of 10 - 1st Grade Math

1. What is the value of $20 - 10$?

   $10$. Subtract the tens digits: $2 - 1 = 1$, so $20 - 10 = 10$.

2. What is the missing number in $90 - \square = 0$?

   $90$. Find what subtracted from $90$ gives $0$.

3. What is $70 - 50$?

   $20$. $7$ tens minus $5$ tens equals $2$ tens.

4. What is the result of $20 - 90$?

   Not allowed here; the difference must be positive or $0$. Cannot subtract a larger number from a smaller one in this skill.

5. What is $50 - 10$?

   $40$. $5$ tens minus $1$ ten equals $4$ tens.

6. What is the value of $50 - 20$?

   $30$. Subtract the tens digits: $5 - 2 = 3$, so $50 - 20 = 30$.

7. What is $80 - 60$?

   $20$. $8$ tens minus $6$ tens equals $2$ tens.

8. What is the value of $30 - 30$?

   $0$. Any number minus itself equals zero.

9. What is the value of $80 - 50$?

   $30$. Subtract the tens digits: $8 - 5 = 3$, so $80 - 50 = 30$.

10. What is $90 - 10$?

    $80$. $9$ tens minus $1$ ten equals $8$ tens.

11. What is the value of $80 - 70$?

    $10$. Subtract the tens digits: $8 - 7 = 1$, so $80 - 70 = 10$.

12. What is the result of $70 - 70$?

    $0$. Any number minus itself equals zero.

13. What is $20 - 10$?

    $10$. $2$ tens minus $1$ ten equals $1$ ten.

14. What is the result of $70 - 30$?

    $40$. Subtract the tens: $7$ tens minus $3$ tens equals $4$ tens.

15. What is the missing number in $\square - 30 = 40$?

    $70$. Find what number minus $30$ equals $40$.

16. What is the value of $80 - 20$?

    $60$. Subtract the tens digits: $8 - 2 = 6$, so $80 - 20 = 60$.

17. What is the value of $60 - 10$?

    $50$. Subtract the tens digits: $6 - 1 = 5$, so $60 - 10 = 50$.

18. What is the result of $90 - 80$?

    $10$. Subtract the tens: $9$ tens minus $8$ tens equals $1$ ten.

19. What is the value of $70 - 30$?

    $40$. Subtract the tens digits: $7 - 3 = 4$, so $70 - 30 = 40$.

20. What is $40 - 10$?

    $30$. $4$ tens minus $1$ ten equals $3$ tens.

21. What is the value of $90 - 80$?

    $10$. Subtract the tens digits: $9 - 8 = 1$, so $90 - 80 = 10$.

22. What is the result of $80 - 10$?

    $70$. Subtract the tens: $8$ tens minus $1$ ten equals $7$ tens.

23. What is the value of $60 - 50$?

    $10$. Subtract the tens digits: $6 - 5 = 1$, so $60 - 50 = 10$.

24. What is the value of $90 - 30$?

    $60$. Subtract the tens digits: $9 - 3 = 6$, so $90 - 30 = 60$.

25. What is the result of $90 - 50$?

    $40$. Subtract the tens: $9$ tens minus $5$ tens equals $4$ tens.

26. What is the value of $90 - 50$?

    $40$. Subtract the tens digits: $9 - 5 = 4$, so $90 - 50 = 40$.

27. What is the value of $40 - 10$?

    $30$. Subtract the tens digits: $4 - 1 = 3$, so $40 - 10 = 30$.

28. What is $90 - 90$?

    $0$. Any number minus itself equals zero.

29. What is the result of $80 - 60$?

    $20$. Subtract the tens: $8$ tens minus $6$ tens equals $2$ tens.

30. What is the value of $70 - 20$?

    $50$. Subtract the tens digits: $7 - 2 = 5$, so $70 - 20 = 50$.

31. What is the missing number in $50 - \square = 20$?

    $30$. Find what number subtracted from $50$ gives $20$.

32. What is $90 - 40$?

    $50$. $9$ tens minus $4$ tens equals $5$ tens.

33. What does it mean to subtract $30$ from $80$ using tens (place value)?

    Subtract $3$ tens from $8$ tens. Think of it as taking away groups of ten.

34. What does the tens digit tell you in a multiple of $10$ such as $70$?

    It tells the number of tens: $70$ is $7$ tens. The tens place shows how many groups of ten make up the number.

35. What does the digit $7$ mean in the number $70$ when using tens?

    $70$ means $7$ tens. In place value, the digit shows how many groups of ten.

36. What is the value of $50 - 40$?

    $10$. Subtract the tens digits: $5 - 4 = 1$, so $50 - 40 = 10$.

37. What is $50 - 40$?

    $10$. $5$ tens minus $4$ tens equals $1$ ten.

38. What is the result of $90 - 10$?

    $80$. Subtract the tens: $9$ tens minus $1$ ten equals $8$ tens.

39. What is the result of $30 - 10$?

    $20$. Subtract the tens: $3$ tens minus $1$ ten equals $2$ tens.

40. What is the value of $1$ ten when subtracting multiples of $10$?

    $1$ ten equals $10$. Each ten represents a group of $10$ ones.

41. What is the result of $100 - 20$?

    Not allowed here; both numbers must be from $10$ to $90$. $100$ exceeds the allowed range of $10-90$.

42. What is $80 - 30$?

    $50$. $8$ tens minus $3$ tens equals $5$ tens.

43. What is the result of $50 - 20$?

    $30$. Subtract the tens: $5$ tens minus $2$ tens equals $3$ tens.

44. What is the result of $30 - 20$?

    $10$. Subtract the tens: $3$ tens minus $2$ tens equals $1$ ten.

45. What is the value of $70 - 60$?

    $10$. Subtract the tens digits: $7 - 6 = 1$, so $70 - 60 = 10$.

46. What is $70 - 70$?

    $0$. Any number minus itself equals zero.

47. Which addition fact checks the subtraction $80 - 30 = 50$?

    $50 + 30 = 80$. Addition and subtraction are inverse operations.

48. What is $40 - 40$?

    $0$. Any number minus itself equals zero.

49. What addition fact can you use to check $80 - 30 = 50$?

    $50 + 30 = 80$. Addition and subtraction are inverse operations.

50. What is the value of $90 - 70$?

    $20$. Subtract the tens digits: $9 - 7 = 2$, so $90 - 70 = 20$.

51. What is $60 - 20$?

    $40$. $6$ tens minus $2$ tens equals $4$ tens.

52. What is the value of $40 - 20$?

    $20$. Subtract the tens digits: $4 - 2 = 2$, so $40 - 20 = 20$.

53. What is $60 - 50$?

    $10$. $6$ tens minus $5$ tens equals $1$ ten.

54. What is $30 - 20$?

    $10$. $3$ tens minus $2$ tens equals $1$ ten.

55. What is the value of $60 - 40$?

    $20$. Subtract the tens digits: $6 - 4 = 2$, so $60 - 40 = 20$.

56. What is the result of $60 - 20$?

    $40$. Subtract the tens: $6$ tens minus $2$ tens equals $4$ tens.

57. What is the result of $40 - 40$?

    $0$. Any number minus itself equals zero.

58. What is the value of $90 - 10$?

    $80$. Subtract the tens digits: $9 - 1 = 8$, so $90 - 10 = 80$.

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