Adding within 20

Problem types

• Add within twenty
• Split an addend to make ten

Builds on

• Making 10
• Teen numbers as a ten and ones · Useful idea

  Adding 8 + 5 by filling a ten leaves 3 more ones, which is the teen number 13 made of one ten and three ones.

Leads to

• Add two-digit numbers
• Equations for addition and subtraction stories
• Counting on and counting back
• The meaning of the equal sign
• Subtracting within 20
• Adding three numbers
• Turnaround addition facts
• Adding and subtracting like fractions

Related skills

None listed.