Exploring Two-Digit Addition Techniques

What is the sum of 28 and 61?

• 99

• 88

• 79

• 89

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

When adding two-digit numbers, where do we start?

• Thousands column

• Hundreds column

• Ones column

• Tens column

Tags

CCSS.2.NBT.B.7

What does the 'T' stand for in the context of adding two-digit numbers?

• Twelve

• Tens

• Two

• Total

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the result of adding 46 and 39 using the long method with carry?

• 95

• 85

• 84

• 75

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

In the long method, how do we handle numbers that sum up to two digits?

• Restart the calculation

• Ignore the tens

• Carry over the tens

• Only add the ones

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the first step in the long method of addition with carry?

• Add the tens column

• Carry over the one

• Expand the numbers

• Add the ones column

Tags

CCSS.2.NBT.B.7

What is the sum of 46 and 39 using the short method with carry?

• 75

• 86

• 95

• 85

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

In the short method, what do we do with a sum that exceeds 9 in the ones column?

• Write it directly under the ones column

• Split it into tens and ones

• Only add the tens column next

• Ignore the excess

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

How do we handle the carry-over in the short method?

• Add it to the ones column

• Subtract it from the final sum

• Add it to the tens column

• Ignore it

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

After splitting a two-digit sum into tens and ones, where do we place the tens?

• Carry it over to the tens column

• Discard it

• Under the ones column

• In the hundreds column

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5