Relate Counting To Addition And Subtraction - 1st Grade Math

1. Which number sentence matches counting on: start at $4$ and say $5,6,7$?

   $4+3=7$. Counting $3$ numbers forward from $4$ gives $7$.

2. What is $10-4$ using counting back?

   $6$. Start at $10$ and count back $9, 8, 7, 6$.

3. What is the related subtraction fact for $6+2=8$?

   $8-6=2$. Addition and subtraction are inverse operations.

4. What is $6-6$ using counting back?

   $0$. A number minus itself always equals zero.

5. What is the result of $7-1$ using counting back?

   $6$. Start at 7, count back 1: "6".

6. What number makes this true: $12 - = 10$?

   $2$. Count back from $12$ to $10$: $11, 10$ is $2$ steps.

7. What is the result of $6-4$ using counting back?

   $2$. Start at 6, count back 4: "5, 4, 3, 2".

8. What is $8 + 1$ using counting on?

   $9$. Start at $8$ and count on $1$: $9$.

9. What is $13 - 4$ using counting back?

   $9$. Start at $13$ and count back $4$: $12, 11, 10, 9$.

10. Identify the missing number: $9-=5$ (use counting back from $9$).

    $4$. Count from $9$ back to $5$: that's $4$ steps back.

11. What addition fact matches the subtraction $8-2=6$?

    $6+2=8$. Addition and subtraction are inverse operations.

12. What is $6 + 2$ using counting on?

    $8$. Start at $6$ and count on $2$: $7, 8$.

13. What is the result of $9+1$ using counting on?

    $10$. Start at 9, count on 1: "10".

14. What does it mean to count on in $5 + 3$?

    Start at $5$ and say $3$ more numbers: $6, 7, 8$. Counting on means starting at the first number and counting forward.

15. What is $9-2$ using counting back?

    $7$. Start at $9$ and count back $8, 7$.

16. What is $7-0$ using counting back?

    $7$. Subtracting zero doesn't change the number.

17. What is the result of $7+3$ using counting on?

    $10$. Start at 7, count on 3: "8, 9, 10".

18. What is the missing number in the count-back sequence for $9-4$: $9,8,,6,5$?

    $7$. Fill in the missing number in the countdown: 9, 8, 7, 6, 5.

19. What is $12 + 5$ using counting on?

    $17$. Start at $12$ and count on $5$: $13, 14, 15, 16, 17$.

20. What is $5+4$ using counting on?

    $9$. Start at $5$ and count $6, 7, 8, 9$.

21. What is $4+0$ using counting on?

    $4$. Adding zero doesn't change the number.

22. What number makes this true: $+ 4 = 11$?

    $7$. Count back from $11$ to find what plus $4$ equals $11$.

23. What is $6-5$ using counting back?

    $1$. Start at $6$ and count back $5, 4, 3, 2, 1$.

24. What is the related subtraction fact for $5 + 6 = 11$?

    $11 - 5 = 6$. Addition and subtraction are inverse operations.

25. What is the missing number in the count-on sequence for $5+3$: $5,6,7,$?

    $8$. Continue the counting sequence: 5, 6, 7, 8.

26. What is $10 + 3$ using counting on?

    $13$. Start at $10$ and count on $3$: $11, 12, 13$.

27. Identify the missing number: $3+=7$ (use counting on from $3$).

    $4$. Count from $3$ to $7$: that's $4$ steps forward.

28. Find and correct the error: Counting on for $5+2$ gives $6$.

    Correct sum: $5+2=7$. Should count $6, 7$ not just $6$.

29. What is $0+9$ using counting on?

    $9$. Zero plus any number equals that number.

30. What is the related addition fact for $9-4=5$?

    $5+4=9$. Adding back what was subtracted gives the original number.

31. Which addition fact matches counting back $2$ from $9$?

    $7 + 2 = 9$. Counting back $2$ from $9$ gives $7$, so $7 + 2 = 9$.

32. What is $11 - 1$ using counting back?

    $10$. Start at $11$ and count back $1$: $10$.

33. What is $9 - 3$ using counting back?

    $6$. Start at $9$ and count back $3$: $8, 7, 6$.

34. What is the result of $10-5$ using counting back?

    $5$. Start at 10, count back 5: "9, 8, 7, 6, 5".

35. What is the result of $5+4$ using counting on?

    $9$. Start at 5, count on 4: "6, 7, 8, 9".

36. What is $14 - 2$ using counting back?

    $12$. Start at $14$ and count back $2$: $13, 12$.

37. Identify the missing addend by counting on: $8 + = 13$.

    $5$. Count on from $8$ to $13$: $9, 10, 11, 12, 13$ is $5$ steps.

38. What is $7 + 4$ using counting on?

    $11$. Start at $7$ and count on $4$: $8, 9, 10, 11$.

39. What is the result of $8+2$ using counting on?

    $10$. Start at 8, count on 2: "9, 10".

40. What number makes this true: $6 + = 9$?

    $3$. Count on from $6$ to $9$: $7, 8, 9$ is $3$ steps.

41. What does it mean to count on to find $6+2$?

    Start at $6$ and say $7,8$; the sum is $8$. Count forward from the first number by the amount of the second number.

42. Identify the missing subtrahend by counting back: $16 - = 12$.

    $4$. Count back from $16$ to $12$: $15, 14, 13, 12$ is $4$ steps.

43. What is the result of $10-2$ using counting back?

    $8$. Start at 10, count back 2: "9, 8".

44. What is $7+3$ using counting on?

    $10$. Start at $7$ and count $8, 9, 10$.

45. What is $8+2$ using counting on?

    $10$. Start at $8$ and count $9, 10$.

46. What is $15 - 5$ using counting back?

    $10$. Start at $15$ and count back $5$: $14, 13, 12, 11, 10$.

47. What is the result of $6+2$ using counting on?

    $8$. Start at 6, count on 2: "7, 8".

48. What subtraction fact matches counting on from $7$ to $10$?

    $10 - 7 = 3$. Counting on $3$ from $7$ gives $10$, so $10 - 7 = 3$.

49. What does it mean to count back to find $9-3$?

    Start at $9$ and say $8,7,6$; the difference is $6$. Count backward from the first number by the amount being subtracted.

50. What does it mean to count back in $9 - 2$?

    Start at $9$ and say $2$ numbers back: $8, 7$. Counting back means starting at the first number and counting backward.

51. What subtraction fact matches the addition $4+5=9$?

    $9-5=4$. Addition and subtraction are inverse operations.

52. What is the result of $9-3$ using counting back?

    $6$. Start at 9, count back 3: "8, 7, 6".

53. Which number sentence matches counting back: start at $8$ and say $7,6$?

    $8-2=6$. Counting $2$ numbers back from $8$ gives $6$.

54. What is the related subtraction fact for $6+2=8$ that subtracts $2$?

    $8-2=6$. Subtracting the addend gives the other addend.

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