Common Core State Standards
Standards for Mathematical Practice
在1年级中，教学时间应集中在四个关键领域：（1）在20范围内对加法，减法和加法和减法的策略发展理解；（2）对整数关系和地位价值的理解，包括分组和一个分组；(3) developing understanding of linear measurement and measuring lengths as iterating length units; and (4) reasoning about attributes of, and composing and decomposing geometric shapes.
32 of 413 teaching resources for those 'aha' moments
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teaching resource
Count and Graph – New Year's Edition
Celebrate the new year by counting festive images and notating their totals as a bar graph.
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Double Dinos - Using Doubles Facts to Add Near Doubles Worksheet
练习“接近双打”的添加策略，以将附加问题解决20。
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2位数 + 1位任务卡
Practice adding 2-digit and 1-digit numbers with this set of 18 number sentence task cards.
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2-Digit + 1-Digit Numbers Addition Worksheet
Practice addition involving 2- and 1-digit numbers with this drill and practice worksheet.
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Addition Strategies: Using Doubles Worksheet
Practice the “using doubles” addition strategy to solve addition problems to 20.
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Addition Strategies: Make a Ten Worksheet
A 2-page worksheet that uses ten frames to model the “making ten” addition strategy.
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加法策略：底座块工作表
Practice using the strategy of using base-10 blocks and regrouping to find the sum.
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Subtraction Strategies Using Addition Worksheet
Use addition to solve subtraction problems with this worksheet.
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Word Problem Task Cards - 2-digit + 1-digit Addition
练习使用这组16个Word问题任务卡添加2位数字和1位数字。
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What's Missing? - Ten More, Ten Less Task Cards
与给定的两位数或三位数的数字相比，使用这组20张任务卡要多10个或十个数字。
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What's Missing? - One More, One Less Task Cards
Practice identifying numbers one more or one less than a given two-digit number with this set of 20 task cards.
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计数到20-剪切和粘贴工作表
Count objects within 20 and match the total to its written number on this 2-page cut-and-paste worksheet.
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Ten More, Ten Less Match-Up - Two-Digit Numbers
Identify ten more or ten less of a given 2-digit number with this set of 36 match up cards
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编写数字工作表的不同方法
Practice and review representing number values as digits, words, expanded form, and base ten.
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加法策略 - 分解，然后制作10个工作表
Build addition strategies using digits 1-10 with this two-page decomposing numbers worksheet.
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加法策略 - 计数工作表
Solve addition problems in this 2-page Counting On Addition Worksheet.
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QR码3位置值寻宝狩猎
A fun activity where students scan QR codes to go on a 3-digit scavenger hunt in the classroom.
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One More, One Less - Cut and Paste Worksheet
Practice adding and subtracting 1 from a given 2-digit number in this cut-and-paste worksheet.
