Maths - Number 1, 2

Fractions to Decimals - 3/5 = 0.6

Adding and Subtracting

2/8 + 1/4 = 2/8 + 2/8 = 4/8

5/8 - 1/4 = 5/8 - 2/8 = 3/8

Ratio

30 pens cost £2.70, how much for 100?

30 : £2.70

10 : £0.90

      100 : £9.00

0.1 10x0.1 = 1 10/0.1 = 100

0.2 10x0.2 = 2 10/0.2 = 50

0.3 10x0.3 = 3 10/0.3 = 33.3

0.4 10x0.4 = 4 10/0.4 = 25

0.5 10x0.5 = 5 10/0.5 = 20

0.6 10x0.6 = 6 10/0.6 = 16.6

0.7 10x0.7 = 7 10/0.7 = 14.3

0.8 10x0.8 = 8 10/0.8 = 12.5

0.9 10x0.9 = 9 10/0.9 = 1.1

Rounding - 3.234567890987654 = 3.2

  4.987657647839278  = 5.0

  5.234567808766452 = 5.23

  6.992348762345873 = 7.00

    7.123123123123123 = 7

Standard Form

2340000 = 2.35 x 106

0.000000123 = 1.21 x 10 -7