Ideal for children aged 7 to 11 (KS2), this fun-filled times-table activity 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 times-table activity book allows children to test their numeracy skills again and again with a built-in 'reveal the answers' feature that uses a moiré device. sakriti opis