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Door 6 · Grade 1

+* Addition Strategies

Secret tricks to add super fast!

▶ Play Door 6

Counting On

Always start with the BIGGER number and count up.
3 + 9? Flip it! Start at 9 and count 3 more: 10, 11, 12.
This saves time and energy!

Worked example

Problem: Use counting on: 2 + 8 = ?

  1. Start with the bigger number: 8.
  2. Count on 2: 9, 10.

Answer: 10

Making Ten

Ten is a friendly number!
To add 8 + 5: take 2 from the 5 to make 8 into 10.
Then 10 + 3 = 13. Easy!
Pairs that make ten: 1+9, 2+8, 3+7, 4+6, 5+5.

Worked example

Problem: Use make ten: 7 + 5 = ?

  1. 7 needs 3 to make 10.
  2. Take 3 from 5, leaving 2.
  3. 10 + 2 = 12.

Answer: 12

Doubles and Near Doubles

Doubles: 4 + 4 = 8, 6 + 6 = 12, 9 + 9 = 18. Memorise them!
Near doubles: 6 + 7 is just double 6 plus 1 more.
6 + 6 = 12, so 6 + 7 = 13.

Worked example

Problem: Use near doubles: 5 + 6 = ?

  1. Double 5 is 10.
  2. Add 1 more: 11.

Answer: 11