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Subtraction Without Borrowing

Direction: Ar...

Question

Direction: Are the given statements correct ? If not, give reasons.
$(72 - 36) - 20 = 72 - (36 - 20)$

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Solution

Not correct, because subtraction of whole numbers is not associative.
If $a, b, c$ are the whole numbers
Then, $(a - b) - c \neq a - (b - c)$
So, the given statement is not correct.

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Similar questions

Direction: Is the given statement correct ? If not, give reason.

$20 \times 40 = 40 \times 20$

Q. Which of the following are co-primes?
(a) 91 and 72
(b) 34 and 51
(c) 21 and 36
(d) 15 and 20

Q. Mark true or false.
(a) (100 + 10) + 5 = 100 + (10 + 5) ____
(b) 100 − (10 − 5) = (100 − 10) − 5 ____
(c) (72 − 36) − 20 = 72 − (36 − 20) ____
(d) (68 × 4) × 20 = 68 × (4 × 20) ____
(e) 7(6 − 3) = 7 × 6 − 7 × 3 ____
(f) 20 × 30 = 30 × 20 ____
(g) 87 − 41 = 41 − 87 ____
(h) 16 × 4 = 4 × 16 ____
(i) 480 + 0 = 0 + 480 ____
(j) (16 + 7) + 3 = 16 + (7 + 3) ____

\frac{cos 36^{0} - cos 72^{0}}{cos 36^{0} cos 72^{0}} = 2

sin 15^{0} = \frac{\sqrt{6} - \sqrt{2}}{4}

Circle the multiples of $8$ : $2, 6, 8, 16, 20, 24, 36, 40, 44, 48, 72, 80$ .

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