Number work

Adding & Subtracting:

When adding and subtracting numbers remember to line up the digits and when they involve decimals always line up the decimals.

Examples

Remember when adding to add the extras and carry on numbers and when subtracting that if the top number is smaller than the bottom you will need to borrow as in the examples above.

Rounding:
Rounding to the nearest 10.

458 rounded to the nearest 10 is 460. 
To round to the nearest 10 look at the units column and remember the rhyme.
5 and above give it a shove (round up), 4 and below down we go (round down)

Another example  19873 rounds to 19870.

Multiplying and dividing by 10, 100 and 1000