Addition+and+subtraction

http://www.youtube.com/watch?v=QQwmkw8VIaM || http://www.youtube.com/watch?v=j5YKVIZQY7k ||  ||
 * http://www.youtube.com/watch?v=BHr9l7eo_1c || http://www.youtube.com/watch?v=JM8SWHVKmYw ||  ||
 * Number line strategy video || Adding in parts - tidy numbers video ||  ||
 * http://www.youtube.com/watch?v=ZEVY7U22NtQ || http://www.youtube.com/watch?v=zZW0gwffOkk ||  ||
 * Dont add subtract video || Problems like 73 + ? = 71 ||  ||
 * http://www.youtube.com/watch?v=UGhQi4e1CcU || http://www.youtube.com/watch?v=zLtGTs-rlfY ||  ||
 * People's ages || Near doubles ||  ||
 * http://www.youtube.com/watch?v=WJzer0flrvk
 * People's ages || Near doubles ||  ||
 * http://www.youtube.com/watch?v=WJzer0flrvk
 * http://www.youtube.com/watch?v=WJzer0flrvk
 * When one number is near 100 || Standard form - algorithms ||  ||
 * http://www.youtube.com/watch?v=D9OPezb8LVc || http://www.youtube.com/watch?v=j5YKVIZQY7k ||  ||
 * Subtraction in parts || Decomposition - subtraction algorithms ||  ||
 * http://www.youtube.com/watch?v=Klt6JTEEfFs || http://www.youtube.com/watch?v=8MP3FPICFXQ ||  ||
 * Saving hundreds || Adding with decimal fractions ||  ||
 * || http://www.youtube.com/watch?v=go9fmBzIXXE ||  ||
 * || Subtraction with tenths ||  ||
 * || http://www.youtube.com/watch?v=go9fmBzIXXE ||  ||
 * || Subtraction with tenths ||  ||
 * || Subtraction with tenths ||  ||