Ideal for children aged 7+ (KS2), this fun-filled addition and subtraction-themed puzzle book allows children to test their numeracy skills again and again, with a built-in 'reveal the answers' feature that uses a moiré device. Ideal for children aged 7 to 11 (KS2), this fun-filled addition and subtraction-themed puzzle book allows children to test their numeracy skills again and again, with a built-in 'reveal the answers' feature that uses a moiré device. ukryj opis