Russia · Grade 1 · Practice Sheet 23

1. 1.

   Fill in the missing number: 15 + ___ = 27.

   Formula:Missing Addend

   $b = \text{total} - a$

   View formula →
2. 2.

   What is double 15?

   Formula:Doubling

   $d = 2 \times n$

   View formula →
3. 3.

   What is 6 + 4?

   Formula:Addition

   $\text{sum} = a + b$

   View formula →
4. 4.

   Add 33 and 23.

   Formula:Addition

   $\text{sum} = a + b$

   View formula →
5. 5.

   What is 6 − 3?

   Formula:Subtraction

   $\text{difference} = a - b$

   View formula →
6. 6.

   What is 9 + 1?

   Formula:Addition

   $\text{sum} = a + b$

   View formula →
7. 7.

   What is 12 − 7?

   Formula:Subtraction

   $\text{difference} = a - b$

   View formula →
8. 8.

   Continue the pattern by counting in 2s: 8, 10, ___

   Formula:Skip Counting

   $\text{next} = \text{term} + \text{step}$

   View formula →
9. 9.

   What is 16 − 9?

   Formula:Subtraction

   $\text{difference} = a - b$

   View formula →
10. 10.

    Continue the pattern by counting in 2s: 8, 10, ___

    Formula:Skip Counting

    $\text{next} = \text{term} + \text{step}$

    View formula →
11. 11.

    What is 7 + 8?

    Formula:Addition

    $\text{sum} = a + b$

    View formula →
12. 12.

    Add 65 and 15.

    Formula:Addition

    $\text{sum} = a + b$

    View formula →
13. 13.

    Fill in the missing number: 15 + ___ = 27.

    Formula:Missing Addend

    $b = \text{total} - a$

    View formula →
14. 14.

    Add 14 and 18.

    Formula:Addition

    $\text{sum} = a + b$

    View formula →
15. 15.

    What is 16 − 6?

    Formula:Subtraction

    $\text{difference} = a - b$

    View formula →
16. 16.

    Fill in the missing number: 10 + ___ = 25.

    Formula:Missing Addend

    $b = \text{total} - a$

    View formula →
17. 17.

    What is double 9?

    Formula:Doubling

    $d = 2 \times n$

    View formula →
18. 18.

    Fill in the missing number: 13 + ___ = 18.

    Formula:Missing Addend

    $b = \text{total} - a$

    View formula →
19. 19.

    Continue the pattern by counting in 10s: 20, 30, ___

    Formula:Skip Counting

    $\text{next} = \text{term} + \text{step}$

    View formula →
20. 20.

    What is 11 − 8?

    Formula:Subtraction

    $\text{difference} = a - b$

    View formula →

© FormulaWon — formulawon.app · Answers & step-by-step working available on the solutions sheet.