I was a TA / helper in primary schools for over twenty years. Once a child starts to lose confidence and feel they can't do things, they probably lose the incentive to try, and fail to put in the effort needed to make any progress.
Praise ANY effort he makes, and also any success in other activities : drawing, colouring, construction, sport, PE, drama, music etc. If he feels he CAN be good at something, even if it is only completing a jigsaw puzzle, or making a Lego model from the instruction book, his confidence may improve.
Try to keep things relaxed, and don't threaten punishments, as that will only worry him more. Maybe encourage him to READ to his younger sibling, or even just tell a made-up story or some traditional tale to him.
Make sure he gets enough sleep, a good diet, a MINIMUM of TV or computer time. Don't have the radio or TV on all the time; establish a quiet, relaxed environment; talk to him as much as you can, and encourage him to talk to you.
To help with Reading and Spelling I recommend this :
An inexpensive and easy to use book, that can encourage children with reading, spelling and writing is mentioned in the MN Book Reviews section. In “Children’s educational books and courses”, the Oxford Phonics Spelling Dictionary presents words by their initial SOUND, unlike a ‘normal’ dictionary, which is always in alphabetical order. Thus, in the ‘S’ section are words like ‘cinema’ and ‘cycle’, which have a ‘S’ sound, even though they are spelt with ‘C’.
The Dictionary is colourful and amusingly illustrated, and can be used by children on their own, or with adult support, from Reception age right up to the start of secondary school.
The review has a link to view sample pages, and purchase if you so wish.
And this may start to help with Numeracy:
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Practical things are best for grasping number concepts - bricks, Lego, beads, counters, money, shapes, weights, measuring, cooking.
Do adding, taking away, multiplication (repeated addition), division (sharing), using REAL OBJECTS as just 'numbers' can be too abstract for some children.
Number Bonds of Ten forms the basis of much maths work, so try to learn them. Using Lego or something similar, use a LOT of bricks (of just TWO colours, if you have enough) lay them out so the pattern can be seen of one colour INCREASING while the other colour DECREASES. Lay them down, or build up like steps.
So:
ten of one colour none of other
nine of one colour one of other
eight of one colour two of other
seven of one colour three of other
etc, etc
then of course, the sides are equal at 5 and 5; after which the colours 'swap over' as to increasing/decreasing.
To learn TABLES, do them in groups that have a relationship, thus:
x2, x4, x8
x3, x6, x12
5 and 10 are easy
7 and 9 are rather harder.
Starting with TWO times TABLE, I always say: "Imagine the class is lining up in pairs; each child will have a partner, if there is an EVEN number in the class. If one child is left without a partner, then the number is ODD, because an odd one is left out."
Use Lego bricks again, lay them out in a column of 2 wide to learn 2x table. Go half way down the column, and move half the bricks up, so that now the column is 4 bricks wide. That gives the start of 4x table.
Then do similar things with 3x and 6x.
With 5x, try and count in 'fives', and notice the relationship with 'ten' - they will alternate, ending in 5 then 10.
It is important to try and UNDERSTAND the relationships between numbers, and not just learn them 'by rote'.
I am sorry it seems complicated trying to explain these concepts, but using Lego or counters should make understanding easier.
An inexpensive solar powered calculator (no battery to run out!) can help learn tables by 'repeated addition'. So: enter 2+2 and press = to give 4. KEEP PRESSING = and it should add on 2 each time, giving 2 times table.
There are good web sites, which can be fun to use :
www.ictgames.com/
www.resources.woodlands-junior.kent.sch.uk/maths/index.html
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