the boy and the coin challenge(精裝)

When a boy longs for enough money to buy a comic book, his grandfather sets him a mystifying challenge: figure out which of two piles of coins has more money in it. Does this sound impossible to solve? It isn''t! And the boy is determined not to give up!The I''m a Maths Star! series comprises challenging Maths puzzles, presented in story form. Puzzles are described and then solved, step-by-step, through an engaging storyline, and using various Maths heuristic techniques that are also taught as part of the world-renowned Singapore Maths curriculum. Through illustrations and an engaging storyline, children will learn Maths heuristics, and be inspired to persevere in understanding, representing, and solving fun and intriguing Maths problems!