Q1
What is (-3) + (-4)?
A-7
B7
C-1
D1
ICSEClass 7 (ICSE)MathematicsCh 1 · Topic 1
Integers
Integers include positive numbers, negative numbers, and zero, and we can add, subtract, multiply, and divide them following specific rules.
Core concept
When adding integers with the same sign, we add their values and keep the sign, like (-3) + (-4) = -7.
How it works
When adding integers with different signs, we subtract the smaller value from the larger and take the sign of the larger, like (-5) + 3 = -2.
Why it matters
When multiplying or dividing integers, like signs give a positive result, and different signs give a negative result.
Key detail
Understanding integer operations is essential for solving real-life problems involving temperatures, money, and elevation.
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Quick notes
• Integers include positives, negatives and zero.
• Same-sign addition: add values, keep sign.
• (-3)+(-4)=-7.
• Different-sign addition: subtract, take larger's sign.
• (-5)+3=-2.
• Same signs in multiplication/division give positive.
• Different signs give negative results.
• Integer operations apply to temperature and money.