Question

1. Find using patterns:
(i) 7854 +99​

Answer 1

91234 + 999

91234 + (1000-1)

92234-1

92233

2. 7854 + 99

7854 + (100-1)

7954-1

7953

3. 731 - 9

731 - (10-1)

721 + 1

722

4. 144 × 5

(100+40+4)×5

500+200+20

720

5. 30641 + 9999

30641 + (10000-1)

40641 - 1

40640

6. 4752 - 99

4752 - (100-1)

4652 + 1

4653

7. 198754 - 999

198754 - (1000-1)

197754 + 1

197755

Answer 2

$7854+99\\7854(100-1)\\7954-1\\7953$

hope it helps you