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6 Beads

If you put three beads onto a tens/ones abacus you could make the numbers 3, 30, 12 or 21. What numbers can be made with six beads?

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Writing Digits

Lee was writing all the counting numbers from 1 to 20. She stopped for a rest after writing seventeen digits. What was the last number she wrote?

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Number Detective

Follow the clues to find the mystery number.

That Number Square!

Stage: 1 and 2 Challenge Level: Challenge Level:1
We've got just one solution to share with you this time. Although doing the activity requires a lot of thinking you may be finding it hard to focus on exactly what you are thinking with each number you decide to pick up.

Christopher from Seoul Foreign School (SFS) 
in South Korea (Korea Republic)
 wrote
:

The fastest way to put the numbers from 1 to 100 in one grid is by putting every number that has a zero at the end of the number in the tenth column. The grid has to start with a 1 or else if there was a zero you would have to skip out the hundred.  The zero placed numbers go in the tenth place column because of this:

1-2-3-4-5-6-7-8-9-10

The ten is in the tenth column or the tenth place.
This gets control of the pattern:

$10$
$20$
$30$
$40$
$50$
$60$
$70$
$80$
$90$
$100$

If you would approach the challenge in a different way, do let us know!