2nd Grade Unit 3 and 4

Which addition problem shows a way to find 29 + 33.

Select all the correct answers.

• 20 + 9 + 3

• 20 + 30 + 9 + 3

• 20 + 20 + 10 + 9 +3

• 20 + 10 + 9 +3

• 50 + 9 + 3

Answer explanation

The correct choices break down 29 + 33 into manageable parts. '20 + 30 + 9 + 3' adds tens and units correctly, while '20 + 20 + 10 + 9 + 3' also sums to 62, showing valid combinations to reach the same total.

Tags

CCSS.2.NBT.B.7

Which addition problem shows a way to find 19 + 44?

Select all the correct answers.

• 10 + 40 + 9

• 10 + 40 + 9 + 4

• 10 + 10 + 9 + 4

• 50 + 9 + 4

• 20 + 43

Answer explanation

The correct choice, 50 + 9 + 4, simplifies to 19 + 44. It combines 50 (40 + 10) with 9 and 4, effectively breaking down the addition into manageable parts that sum to 63.

Tags

CCSS.2.NBT.B.5

Mateo found 48 coins last month. This month he found 9 more coins.

How many coins does he have now?

• 57

• 39

• 59

• 37

Answer explanation

Mateo found 48 coins last month and 9 more this month. To find the total, add 48 + 9, which equals 57. Therefore, the correct answer is 57.

Tags

CCSS.2.OA.A.1

35 white eggs and 25 brown eggs.

How many eggs together?

• 50

• 45

• 60

• 55

Answer explanation

To find the total number of eggs, add the white eggs (35) and the brown eggs (25). 35 + 25 = 60. Therefore, the correct answer is 60.

Tags

CCSS.2.OA.A.1

Choose the two expressions that have

the same sum as 69 + 17.

• 70 + 16

• 70 + 7

• 69 + 8

• 6 + 9 + 1 + 7

• 60 + 9 + 10 + 7

Answer explanation

The sum of 69 + 17 is 86. The expression 70 + 16 also equals 86 (70 + 16 = 86). The expression 60 + 9 + 10 + 7 equals 86 as well (60 + 9 + 10 + 7 = 86). Thus, both are correct.

Tags

CCSS.2.NBT.B.5

4 tens and 2 ones + 4 tens and 5 ones

• 78

• 82

• 87

• 79

Answer explanation

To solve, add the tens and ones separately: (4 tens + 4 tens) + (2 ones + 5 ones) = 8 tens + 7 ones = 80 + 7 = 87. Thus, the correct answer is 87.

Tags

CCSS.2.NBT.B.5

CCSS.1.NBT.C.4

5 tens and 3 ones + 2 tens and 7 ones

• 80

• 73

• 77

• 89

Answer explanation

To solve, add the tens and ones separately: (5 tens + 2 tens) = 7 tens (70) and (3 ones + 7 ones) = 10 ones. 10 ones equals 10, so 70 + 10 = 80. Thus, the correct answer is 80.

Tags

CCSS.2.NBT.B.5

CCSS.1.NBT.C.4

Which addition problem shows a way to find 23 + 37?

Select all the correct answers.

• 20 + 30 + 3 + 7

• 20 + 30 + 10

• 25 + 35

• 50 + 10

• 20 + 40

Answer explanation

The correct choice, 20 + 30 + 3 + 7, breaks down 23 and 37 into manageable parts: 20 and 30 for the tens, and 3 and 7 for the units, effectively showing how to add them to find the total of 60.

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Find the sum of 54 + 28

• 5428

• 712

• 82

• 72

Answer explanation

To find the sum of 54 and 28, simply add the two numbers: 54 + 28 = 82. Therefore, the correct answer is 82.

Tags

CCSS.2.NBT.B.5

CCSS.1.NBT.C.4

Bella had some pennies saved in a jar.

She took 30 pennies out to buy a pencil.

Now Bella has 42 pennies in the jar.

Select the number of pennies that were in

the jar before Bella bought the pencil.

• 30

• 42

• 12

• 72

Answer explanation

Before buying the pencil, Bella had 42 pennies left after taking out 30. Therefore, the total before the purchase was 42 + 30 = 72 pennies.

Tags

CCSS.1.OA.A.1