S.chand class 6 Mathematics Chapter 3 Exercise 3B

 

EXERCISE 3 B

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1. Write ‘T’ for True or ‘F' for False for the following statements.
(i) The sum of two negative integers is always a positive integer.
(ii) The sum of three different integers can never be zero.
(iii) (-5) + (+2) = (+5) + (-8)
(iv) When an integer is added to itself, the sum is always greater than the integer.
(v) If (-27) + \boxed = (+11) , then \boxed = (+38)

2. Write an addition sentence for each of the following number lines

(i)
(ii)
(iii)
(iv)

3. Add the following using a number line
(i) (+3) + (-6)
(ii) (-2) + (+8)
(iii) (+3) + (-9)
(iv) (+1) + (+6)
(v) (-5) + (+5)
(vi) (-1) + (-2) + (-4)

4. Add:
(i) (-16) + (+12)
(ii) (-14) + (-15)
(iii) (-25) and (+62)
(iv) (+41) and (-54)
(v) (-12) + (+5) + (-18)
(vi) (-29) + (+40) + (-9)
(vii) (+1000) + (-1998) + (+498) + (-500)
(viii) (-771) + (-279) + (-492)
(ix) (-64) + (+100) + (+14) + (-150)

5. Fill in the blanks with the correct integer to make each sentence true .
(i) (+3) + ___ = (-2)
(ii) ___ + (+5) = (-11)
(iii) (+27) + ___ = (+16)
(iv) ___ + (-13) = 0
(v) (-12) + ___ = (-25)

6. Use > , < or = to make each sentence true .
(i) (+7) + (-4) ___ (-9) + (+2)
(ii) (+20) + (-7) ___ (+6) + (+9)
(iii) (+5) + (-2) ___ (-19) + (+11)
(iv) (-8) + (+8) ___ (+12) + (-12)
(v) (+25) + (-12) ___ (-29) + (+40)
(vi) (+7) + (-4) + (-2) ___ (-5) + (+17) + (-9)

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