Adding multi-digit numbers

What do we do first in this addition problem?

• Write the numbers in expanded form.

• Add the ones place.

• Write the numbers in standard form.

Tags

CCSS.2.NBT.B.7

Write the numbers in expanded form.

• 800+32

  +100+ 23

• 832

  + 123

• 800+ 30 + 2

  + 100 + 20 +3

Tags

CCSS.2.NBT.B.7

Once the numbers are in expanded form, now what do we do?

• Start in the hundreds place and add the two numbers in the hundreds place.

  Add 8 + 1.

• Start in the tens place and add the two numbers in the tens place. Add 3 + 2.

• Start from the ones place and add the two numbers in the ones place.

  Add 2 + 3.

Tags

CCSS.2.NBT.B.7

Add the numbers in the ones place.

• 2

  + 3

  5

• 8

  + 1

  9

• 32

  + 23

  55

Tags

CCSS.2.NBT.B.7

After we complete the ones place, what do we add now?

• Add the ones place.

• Add the hundreds place.

• Add the tens place.

Tags

CCSS.2.NBT.B.7

Add the numbers in the tens place.

• 32

  +23

  755

• 30

  +20

  50

• 8

  +1

  9

Tags

CCSS.2.NBT.B.5

CCSS.1.NBT.C.4

After the tens place, what place value do we add now?

• The hundreds place.

• The ones place.

• The tens place.

Tags

CCSS.2.NBT.B.7

Add the hundreds place.

• 30

  +20

  50

• 830

  +120

  950

• 800

  +100

  900

Tags

CCSS.2.NBT.B.7

Now that all of the place values have been added, what is our last step?

• Write the number in expanded form.

• Write the number in standard form.

• Write the number in word form.

Tags

CCSS.2.NBT.B.7

The answer to 823 + 123 is.........

• 875

• 900

• 955

Tags

CCSS.3.NBT.A.2

CCSS.2.NBT.B.7