Route through multiplication
2nd
Know pairs and doubles
                              eg: 3 books doubled
                  
ANd9GcSNdIWIV6XTFJXL8RWhhHKuMSwU9g4qzK4qp54AgFrNPZIgG8iD ANd9GcSNdIWIV6XTFJXL8RWhhHKuMSwU9g4qzK4qp54AgFrNPZIgG8iD ANd9GcSNdIWIV6XTFJXL8RWhhHKuMSwU9g4qzK4qp54AgFrNPZIgG8iD ANd9GcSNdIWIV6XTFJXL8RWhhHKuMSwU9g4qzK4qp54AgFrNPZIgG8iD ANd9GcSNdIWIV6XTFJXL8RWhhHKuMSwU9g4qzK4qp54AgFrNPZIgG8iD ANd9GcSNdIWIV6XTFJXL8RWhhHKuMSwU9g4qzK4qp54AgFrNPZIgG8iD
 Record as    3 + 3