Adding Using Expanded Form Lesson

How would I use expanded form to solve 326+123?

• 300+2+6

  +100+2+3

  =400+4+9=449

• 300+20+6

  +100+20+3

  =400+40+9=449

• 3+2+6

  +1+2+3

  =4+4+9=449

• 449

How would you solve 401+411 with expanded form?

• 401

  +411

  =812

• 400+1

  +400+1+1

  =800+1+1=812

• 400+0+1

  +400+1+1

  =8+1+1=812

• 400+0+1

  +400+10+1

  =800+10+1=812

• 40 + 30 + 9 + 0 = 79
• 40 + 3 + 9 = 52
• 4 + 9 + 3 + 0 = 16
• 40 + 30 + 9 = 89

Write the number in number form. 

• 258
• 377
• 358
• 659

300+60+8=

• 386
• 123
• 308
• 368

901 in expanded form

• 900+0+1
• 90+0
• 9+1
• 4+5

Find the sum of the numbers using the base 10 blocks.

• 73
• 65
• 34
• 56

Add the base ten blocks.  What is the sum?

• 89
• 78
• 98
• 87

Add the base ten blocks.  What is the sum?

• 85
• 58
• 88
• 83

Add the base ten blocks.  What is the sum?

• 79
• 80
• 81
• 90