Adding within 100

Problem types

• Add two-digit numbers
• Make one hundred

Builds on

• Add two-digit numbers
• Ten more and ten less · Useful idea

  Adding a number of tens to a two-digit number changes only the tens digit, which gives a quick way to add within 100.

Leads to

• Coins and bills
• Adding several two-digit numbers
• Subtracting within 100
• Perimeter of a polygon

Related skills

None listed.