Adding Integers Using Models

Which equation represents the 2-color counters shown in the image? (Yellow is Positive and Red is Negative)

• -4 + 5 = -1

• 4 + 5 = 9

• 4 + (-5)= -1

• -5 - 4 = -9

Answer explanation

The question asks for the equation representing the 2-color counters, with yellow being positive and red being negative. The correct choice is 4 + (-5) = -1, as it represents 4 positive (yellow) counters and 5 negative (red) counters, resulting in a total of -1.

Which addition equation matches the problem modeled below? (Yellow is positive and Red is negative)

• -2 + -4 = -6

• 2 + -4 = -2

• 4 + 2 = 6

Answer explanation

The question asks for an addition equation that matches the given problem with yellow representing positive numbers and red representing negative numbers. The correct choice is 2 + -4 = -2, as it represents the addition of a positive number (yellow) and a negative number (red) resulting in a negative sum.

What equation is modeled?

• 15 + 25 = -10

• 15 + (-25 )= -10

• -10 + 15 = -10

• -25 + 15 = -10

What equation is modeled?

• -7 + 8 =1

• -7 + 9 = 1

• 1 + -7 = -7

• 8 + -7 = 1

Answer explanation

The question asks for the correct equation among the given options. The correct choice is '-7 + 8 = 1', as it accurately represents the mathematical relationship between the numbers. When you add -7 and 8, you get a result of 1, which confirms that this equation is modeled correctly.

Find the sum of the integer model shown.

• -5 + 3 = -2

• 5 + (-3) = 2

• 5 + 3 = 8

• -5 + (-3) = -8

• A
• B
• C
• D

Which equation represents the 2-color counters shown in the image? (Yellow is Positive and Red is Negative)

• -4 + 5 = -1

• 4 + 5 = 9

• 4 + (-5)= -1

• -5 - 4 = -9

-2 + 4 

Which counter set models the expression -4 + 5?

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• 4 + 1 = 5
• 4 - (-1) = 5
• 4 + -1 = 3