the twins and the brain battle（精）

When a pair of twins cannot agree on who is better in Maths, their father sets them a baffling problem. With just a few clues, who will find the answer first?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!Series features: