# KS1 lesson: Counting, Ordering, Partitioning

Numbers are made of digits, a digit is:

Numbers can have two, three, and four digits or even more:

 thousands hundreds tens units digits 4 6 two digits 2 5 3 three digits 3 9 6 2 four digits

Ordering numbers

The more digits a number has, the higher it is.

To order the numbers faster is easier to use number line:

44 comes before 47 on the number line because is smaller

If you need to put in order two numbers with the same amount of digits then you need to see which one has the highest first digit

428 is bigger then 328

428 is smallest then 482

321 is smaller then 322

Partitioning Numbers

Partitioning is breaking up numbers into hundreds, tens and units:

Example:28= 20+8

273= 200+ 70+3

427= 400+ 20+7

More examples:

427= 300+120+7

258= 200+40+18

845= 600+245

You can even calculate easier this way:

23+66 = > 23=   20 + 3

66=  60 + 6

=>80 + 9 = 89

275 + 314 = > 275= 200 +70 +5

314=300 +10 +4

500+ 80+ 9 = 589

Click to practice partitioning.

Decimal numbers

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