Grade 7 Knowledge Check Quiz

Answer explanation

To find the sum of 5 and 7, simply add the two numbers: 5 + 7 = 12. Therefore, the correct answer is 12.

Answer explanation

To calculate -8 + (-3), add the two negative numbers: -8 + (-3) = -8 - 3 = -11. Therefore, the correct answer is -11.

Answer explanation

To find the result of 9 + 4, simply add the two numbers together. 9 plus 4 equals 13, which is the correct answer. The other options do not represent the sum of these two numbers.

Answer explanation

To solve -6 + (-2), add the two negative numbers: -6 + (-2) = -6 - 2 = -8. Therefore, the correct answer is -8.

Answer explanation

To find the sum of 15 and 6, simply add the two integers: 15 + 6 = 21. Therefore, the correct answer is 21.

Answer explanation

To find the sum of -10 and -7, add the two negative numbers: -10 + (-7) = -10 - 7 = -17. Therefore, the correct answer is -17.

• Positive

• Negative

• Zero

• Cannot be determined

Answer explanation

When you add two positive integers, like 8 and 5, the result is always positive. Therefore, the correct answer is 'Positive'.

Answer explanation

Adding -12 and -9 gives -21. This shows that the sum of two negative integers is always negative, confirming that combining negative values results in a more negative outcome.

Mason and Anika are both adding their favorite numbers, and both numbers have the same sign. Which of the following is always true about the sum of their numbers?

• The sum is always zero

• The sum has the same sign as the integers

• The sum is always positive

• The sum is always negative

Answer explanation

When adding two integers with the same sign, the result will also have that same sign. For example, adding two positive integers yields a positive sum, and adding two negative integers yields a negative sum.

• It is always positive

• It is always negative

• It is always zero

• It can be positive or negative

Answer explanation

Since both a and b are negative integers, their sum a + b will also be negative. Adding two negative numbers always results in a negative number, making the correct choice 'It is always negative'.