Complete the following exercise:
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Complete the following exercise:
Let's remember the rule:
Therefore, the sign of the exercise result will be positive:
15
Solve the following exercise:
\( (+6)\cdot(+9)= \)
This is called the commutative property! Whether you have 5 groups of 3 or 3 groups of 5, you end up with the same total. Both equal 15.
Try skip counting! For 5 × 3, count by fives three times: 5, 10, 15. Or use your fingers to make three groups of five.
The × symbol means 'groups of'. So 5 × 3 means three groups of five, or taking the number 5 exactly 3 times.
For basic problems like this, both numbers are positive, so your answer is positive too. The sign rule applies here.
Use estimation! Since 5 × 3 means 5 taken 3 times, it must be bigger than 5 but not huge. Only 15 makes sense as a reasonable answer.
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