Hi sashangel:
Several ideas come to mind:
First off can she write numbers 0 - 9?
If not - make sure she can - then make sure she can say them all if she sees them.
So if you wrote '4' on a sheet of paper - she'd say 4.
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Step 2: Can you DC count by 10s to 100?
10, 20, 30, 40, 50, 60, 70, 80, 90 and 100.
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Now this may seem odd, but 4-5 years old can be oddly logical creatures - I had to explain what the first number in 23 was doing - what it's job was.
So at the point we got into two digit numbers, I explained that each column represented special kinds of numbers.
The first column (at right) is the Units column - and that number there is for each unit (1 = 1 unit, 2 = 2 units, etc...) you have. The second column (the one on the left) is the tens column and numbers in this column indicate how many tens you have so the '2' in 23 = 2 tens, the 4 in 45 = 4 tens, etc...
At this point I introduced grapes (tens) and raisins (units):
I'd put 3 grapes and 4 raisins on a plate.
How many grapes do I have. DD2 would say 3. I'd explain that each grape = 10 - so if I have 3 grapes - how many tens do I have? (DD2 could count by 10 at this point). DD2 would answer 3 grapes = 3 tens = 30.
So we have 30 + 4 raisins. DD2 couldn't add 4 on in one jump at first, so we used to count by ones. We have 30, 31, 32, 33, 34 in total. Then maybe count by twos.
The grape / raisin thing comes into its own with addition/ subtraction especially when you have to carry or borrow. You can cash in a grape for 10 raisins or visa versa.
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As ever Woodland Junior School Maths Zone has some great place value games: resources.woodlands-junior.kent.sch.uk/maths - Click place value off the menu (right column - 2nd down under NUMBER SKILLS) try Dino Place value to start with. It will show a number - say 15 - and you have to select one 10 and 5 to make 15.
If you play the 'free' on Bead Numbers you can use it like an abacus - so your DC can see what placing beads in certain columns creates- and get the idea of hundreds - tens - unit columns.
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I have recently discovered that Oxford Owl has an early maths website (this is free by the way) aside from their wonderful reading site. You might like to try it out: www.oxfordowl.co.uk/welcome/for-home/maths-owl/maths.
They are apparently working on booklets/ videos for maths - in the same way they have how to help with reading at home on the reading section of their website. These are not out yet - but they say they're coming soon - so keep an eye out.
HTH