I would round it up or down then add / subtract the amount you rounded.

So £1.95 would be £2 and £9.95 would be £10.

£10 + £2 is £12

Then minus the 10p that was rounded.

£12.00 - £0.10 = £11.90

In regards to multiplication use simple techniques like.

Multiplying by 2 would be just doubling each number.

£5 x 2 = £5 + £5 = £10

Multiplying by 3 can be made easy by doubling then adding the or... more

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Practice makes perfect!

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