Bar models: books for the class library Teacher key and guidance supporting this exact edition Teacher check 28 − 15 = 13 more story books. 28 + 15 = 43. Then 43 + 9 = 52 and 52 − 12 = 40. The check is 40 + 12 = 52. Teacher companion Page 1 of 1
Bar models: books for the class library Teacher key and guidance supporting this exact edition Teacher check 28 − 15 = 13 more story books. 28 + 15 = 43. Then 43 + 9 = 52 and 52 − 12 = 40. The check is 40 + 12 = 52. Teacher companion Page 1 of 1