{"product_id":"math-mammoth-add-subtract-2-a","title":"Math Mammoth Add \u0026 Subtract  2-A","description":"\u003cp\u003eMath Mammoth Add \u0026amp; Subtract 2-A deals with two main themes:\u003c\/p\u003e\n\n\u003cp\u003e- strategies for adding and subtracting within 0-20; such as adding just one more, a trick with nine and eight, and subtracting using addition;\u003cbr\u003e\n- memorizing the basic addition and subtraction facts of single-digit numbers with an answer between 10 and 18.\u003c\/p\u003e\n\n\u003cp\u003eWhile focusing on addition and subtraction techniques, the lessons also include many word problems.\u003c\/p\u003e\n\n\u003cp\u003eThe goal is to memorize the facts, or at least become so fluent with them that an outsider cannot tell if the child remembers the answer or uses some mental math strategy to get the answer. Some children will accomplish this quicker and need less practice, whereas others will take longer. Thus, donÕt assign all the exercises in the book by default. Use your judgment, and try to match the amount of exercises to your childÕs need. You can also use games to reinforce the facts, and in place of some of the exercises in the book (a list of games is provided in the book).\u003c\/p\u003e\n\n\u003cp\u003eThe book starts with a few mental math strategies (Add Using ÒJust One MoreÓ and A Trick with Nine and Eight). The lesson Adding within 20 reviews those strategies and gives more practice. These initial lessons don't yet involve actual memorization techniques.\u003c\/p\u003e\n\n\u003cp\u003eThe lesson Subtract to Ten explains another basic strategy, and has to do with subtracting in parts. For example, to do 13 _ 5, one can subtract 5 in two parts: first do 13 _ 3, which equals 10, and then subtract the rest, or 2 more. Memorizing the subtraction facts will be more efficient, but I want children to understand this strategy, because it is useful in many other situations also.\u003c\/p\u003e\n\n\u003cp\u003eThen we review how to complete the next whole ten, which is an important concept. An example of this concept is the question: What number do you add to 23 to get 30? As an equation, we write: 23 + __ = 30.\u003c\/p\u003e\n\n\u003cp\u003eIn the next lesson, we study sums that go over ten, doing these sums in two parts.\u003c\/p\u003e \n\n\u003cp\u003eThe next lessons, Adding with 9, Adding with 8, Adding with 7, and Adding with 6, provide lots of practice for learning and memorizing the basic addition facts.\u003c\/p\u003e \n\n\u003cp\u003eThe last part of the book includes various lessons titled Number Rainbows and Fact Families with.... These give lots of practice and reinforcement for the basic addition and subtraction facts, emphasizing the connection between addition and subtraction as a strategy for subtraction facts.\u003c\/p\u003e","brand":"Maria Miller","offers":[{"title":"Paperback","offer_id":44229214077089,"sku":"9781111127100","price":27.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0462\/1120\/3233\/files\/1wvwe76-front-shortedge-384_aaaac1a3-9a42-4d54-b841-5f8e5c41148d.jpg?v=1747544531","url":"https:\/\/bookswholesale.myshopify.com\/products\/math-mammoth-add-subtract-2-a","provider":"BooksWholesale","version":"1.0","type":"link"}