2nd Grade Arrays and Equal Groups Quiz: 10 Questions with Explanations

A 5 rowsB 2 rowsC 10 rowsD 7 rows

Rows go across. There are 2 rows. The 5 counts the columns.

A \(4 + 4 + 4 = 12\)B \(3 + 3 + 3 + 3 = 12\)C \(4 + 3 = 7\)D \(4 + 4 + 4 = 8\)

Each of the 3 rows has 4, so write 4 three times. The other 12-sentence adds the columns.

A 7 circlesB 16 circlesC 15 circlesD 12 circles

Add 3 for each of 4 rows: 3 + 3 + 3 + 3 = 12. Adding 4 + 3 gives only 7.

A 10 cookiesB 7 cookiesC 12 cookiesD 25 cookies

2 + 2 + 2 + 2 + 2 = 10. Adding 5 + 2 gives only 7.

A \(3 + 3 + 3 + 3 + 3 = 15\)B \(5 + 3 = 8\)C \(5 + 5 + 5 = 10\)D \(5 + 5 + 5 = 15\)

There are 3 columns with 5 in each, so write 5 three times. Writing 3 five times adds the rows.

A 12 marblesB 7 marblesC 16 marblesD 9 marbles

4 + 4 + 4 = 12. Adding the bag count and the marbles per bag gives 7.

A 4 objectsB 5 objectsC 16 objectsD 24 objects

5 + 5 + 5 + 5 = 20, so each row has 5.

A 2 rows of 5 and 5 rows of 3B 3 rows of 3 and 4 rows of 4C 3 rows of 4 and 4 rows of 3D 2 rows of 4 and 3 rows of 4

Both are 12: 4 + 4 + 4 and 3 + 3 + 3 + 3. The other pairs have totals 10 and 15, 9 and 16, or 8 and 12.

A 12B 18C 15D 8

Five threes make 15. Four threes make 12.

A 10 plantsB 20 plantsC 15 plantsD 25 plants

There are 4 rows of 5: 5 + 5 + 5 + 5 = 20. The first two rows alone make 10.