Using grouping if applicable:

Evaluate 12 + 15

(10) + 2

(10) + 5

(10 + 10) + 2 + 5

20 + 7

12 + 15 = **27**

12 + 15 = **27**

27

Free Number Bonds Calculator - Adds or subtracts 2 numbers and using grouping by 10 or 100. Also called number bonds or addition facts. Multiplies two numbers using tape diagrams.

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- addition
- math operation involving the sum of elements
- diagrams
- grouping
- number
- an arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity and used in counting and making calculations and for showing order in a series or for identification. A quantity or amount.
- number bonds
- subtraction
- math operation involving the difference of elements

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