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Grade 1 - Mathematics
3.14 Doubles Plus One

Method:
  1. Read out the numeric expression given.
  2. Reduce it to the form such that it results in doubles with a 1 added to it.

Example:
Write 9 + 10 in doubles plus one form.

Look at the numbers in the above numeric expression.
Here we rewrite 10 as 9 + 1
9 + 10 = 9 + 9 + 1
Answer: 9 + 9 + 1


Directions: Answer the following questions. Also write at least ten examples of your own.
Q 1: Write 3 + 4 in doubles plus one form.
2 + 2 + 3 = 7
3 + 3 + 1 = 7
4 + 0 + 3 = 7
5 + 1 + 1 = 7

Q 2: Write 25 + 26 in doubles plus one form.
24 + 25 + 2 = 51
23 + 24 + 1 = 51
25 + 26 + 1 = 51
25 + 25 + 1 = 51

Q 3: Write 6 + 7 in doubles plus one form.
6 + 6 + 1 = 13
8 + 2 + 3 = 13
7 + 4 + 2 = 13
5 + 5 + 3 = 13

Q 4: Write 4 + 5 in doubles plus one form.
4 + 4 + 1 = 9
6 + 2 + 1 = 9
3 + 5 + 1 = 9
2 + 2 + 5 = 9

Q 5: Write 5 + 6 in doubles plus one form.
7 + 2 + 2 = 11
7 + 2 + 2 = 11
5 + 5 + 1 = 11
6 + 3 + 2 = 11

Q 6: Write 8 + 9 in doubles plus one form.
7 + 7 + 3 = 17
9 + 6 + 2 = 17
6 + 6 + 5 = 17
8 + 8 + 1 = 17

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Question 8: This question is available to subscribers only!


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