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Synopsis
As a result of media and parental attention to need for improvement of core skills, this is a fast-paced mental arithmetic book to encourage mastery of two of the four rules of number. It is part of a range of books which includes "Complete Mastery" and "Superhuman Calculator". The book recommends that children spend 15 minutes each day using this book to compete against themselves or against friends. They do the tests again and again becoming increasingly accurate and beating their own times. Eventually they should be able to do all the sum in 30 seconds and become a "30-second champion"! Children need scrap paper, a watch with a second hand, scrap paper and a calculator.
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30 Second Challenge: Super Quick Adding And Subtracting in Your Head
Seller: WeBuyBooks, Rossendale, LANCS, United Kingdom
Seller rating 5 out of 5 stars
Condition: Very Good. Most items will be dispatched the same or the next working day. A copy that has been read, but is in excellent condition. Pages are intact and not marred by notes or highlighting. The spine remains undamaged. Seller Inventory # rev8382611803
Quantity: 1 available
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Super-quick Adding and Subtracting in Your Head (30 Second Challenge)
Seller: MusicMagpie, Stockport, United Kingdom
Seller rating 5 out of 5 stars
Condition: Very Good. 1753085131. 7/21/2025 8:05:31 AM. Seller Inventory # U9780721434469
Quantity: 1 available