NRT

Question 1

Trick for long multiplications: E.g. What is the result of 2,348 × 237?

Answer 1

For example, to multiply by 237 you multiply by:
7 (units)
3 (tens)
2 (hundreds)
(It doesn’t matter in which order you complete the calculation.)
2,348
237 × = Multiplier
16,436 = 2,348 × 7
70,440 = 2,348 × 30
469,600 = 2,348 × 200
556,476 = 16,436 + 70,440 + 469,600

Question 2

Four steps in a long division
calculation

Answer 2

There are four steps in a long division question.
Step 1 Divide (D)
Step 2 Multiply (M)
Step 3 Subtract (S)
Step 4 Bring down (B)

Question 3

How to remember DMSB?

Answer 3

You can remember this as D-M-S-B with any mnemonic that
helps you to remember the order. Do-Mind-Slippery-Bananas.
Dirty-Muddy-Salty-Bicycles. Follow the steps in order and repeat
until you have worked through the whole calculation.

Question 4

Tips to find multiples

Answer 4

An integer is divisible by:
2, if the last digit is 0 or is an even number
3, if the sum of its digits are a multiple of 3
4, if the last two digits are a multiple of 4
5, if the last digit is 0 or 5
6, if it is divisible by 2 and 3
9, if its digits sum to a multiple of 9

Question 5

Millions, billions and trillions

Answer 5

US definition
Million: 1,000,000 or ‘a thousand thousand’ (same as UK definition)
Billion: 1,000,000,000 or ‘a thousand million’
Trillion: 1,000,000,000,000 or ‘a thousand billion’
UK definition
Million: 1,000,000 or ‘a thousand thousand’ (same as US definition)
Billion: 1,000,000,000,000 or ‘a million million’
Trillion: 1,000,000,000,000,000,000 or ‘a million million million’
The US definitions are more commonly used now. If you are in doubt
and do not have the means to clarify which notation is being used,
assume the US definition