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\nof prerequisite skills.  \nTo the Teacher:These pages provide activities for additional practice ofprerequisite skills for grade-level mathematics concepts.These pages canbe used separately or with the following Check What You Know resources:  \nIntervention Strategies and Activities Cards,Copying Masters,CD-ROM,or Transparencies  \nName                   \nOrdinal Numbers  \n# NumbersWho's First?What's the Address?\n\nWrite the number.Build-a-Number  \nWrite the correct position of each animal.  \nFirst  \n3rd  \n5th  \nSecond  \nfifth  \nthird  \nThird  \n6th  \n1st  \nFourth  \nsixth  \nfirst  \nFifth  \n2nd  \n4th  \nSixth  \nsecond  \nfourth  \n# 3.NameName\n\n2 CheckWhat You Know Enrichment  \nCheck What You Know Enrichment 1  \nOrcer NumbersComparing PairsSailing Along  \nWrite the lighthouse numbers on the boats in order fromleast to greatest.Use the numbers above.  \nCompare the numbers.Choose a number which makesthe sentence true.Possible answers are given.       greater than   19   greater than   38   \n3.   62   is       greater than   50   less than   41  47 is  less than   62   \n6.   38  is  less than    50 Coose two numbers from above.Compare the numbers.Possible answers are given.  \n◎Harcourt  \n7.  50 is greater than 47  \nCheck What You Know Enrichment 34 Check What You Know Enrichment  \n2 Check What You Know Enrichment  \nName                                            Additon FactsName                                    2-Digit AdditionFind Patterns When AddingAdd 2-Digit Numbers on a Hundred Chart  \nWrite the addend and sum to complete the pattern.You can use a hundred chart to add.555·Find the sum,24+10.+1+2+3十4±6+7+8+9·Start at 24.To add 10move6781112down 1 row in the same column.1314So 24+10=34.  \n\n| 1   | 2   | 3   | 4   | 5   | 6   | 7   | 8   | 9   | 10   |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n| 11   | 12   | 13   | 14   | 15   | 16   | 17   | 18   | 19   | 20   |\n| 21   | 22   | 23(   | 24   | 25   | 26   | 27   | 28   | 29   | 30   |\n| 31   | 32   | 33(   | 3   | 35   | 36   | 37   | 38   | 39   | 40   |\n| 41   | 42   | 43   | 44   | 45   | 46   | 47   | 48   | 49   | 50   |\n| 51   | 52   | 53   | 54   | 55   | 56   | 57   | 58   | 59   | 60   |\n| 61   | 62   | 63   | 64   | 65(   | 66   | 67   | 68   | 69   | 70   |\n| 7   | 72   | 73   | 74   | 75   | 76   | 77   | 78   | 79   | 80   |\n| 81   | 82   | 83   | 84   | 85(   | 86)   | 87   | 88(   | 89   | 90   |\n| 91   | 92   | 93   | 94   | 95   | 96   | 97   | 98   | 99   | 100   |\n\n+5  \n10  \n26666·Find the sum,66+23.666·Start at 66.To add 20,move245+689down 2 rows.  \n·To add 3,move right 3 spaces.789101112131415So 66+23=89.Use the chart.Find the sum.7777Mark the hundred chart to show3+4+567+8+9how you added.8910111213141516Check that students havemarked the hundred chart8888+1+2+348101112131415161799999999+2+345781012131415161718  \nto show how they added.  \n25+12=  17  \n1.18+10=28  \n\n| 3.12+31=  43   | 4.44+20=64   |\n| --- | --- |\n| .55+24=79   | 6.11+40=51   |\n| 7.53+35=88   | 8.66+4=70   |\n\n5  \n6.Look at the rows of facts you completed.  \nWrite about any patterns you see.Answers may vary.Possible answer:The addend is 1 greater each time.The sum is 1 greater each time.  \n7.Choose one fact that helps you find the sum of another fact.Explain how you use the fact to help.Answers may vary.Possible answer:Since 7+7=14,8+7 is 1 more.So 8+7=15.       \n9.71+26=  97  \n10.89+11=100  \nCheck What You Know Enrichment 56 Check What You Know EnrichmentName                                            2-Digit SubtractionThree in a RowSubtract 2-Digit Numbers on a Hundred Chart  \nSubtract.Put an X over the difference of 10 or greater.You can use a hundred chart to subtract.Put an O over the difference less than 10.·Find the difference,36-10.  \n\n| 1   | 2   | 3   | 4   | 5   | 6   | 7   | 8   | 9   | 10   |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n| 11   | ","cbCaimoXkyijbQl2","https://ap.wps.com/l/cbCaimoXkyijbQl2","pdf",4063242,"English","# Ordinal Numbers\n## Who’s First? What’s the Address?\n# Number Practice and Comparisons\n## Comparing Pairs\n# 2-Digit Addition\n## Add 2-Digit Numbers on a Hundred Chart\n# Patterns in Addition Facts\n## Explain Patterns and Use Facts\n# 2-Digit Subtraction\n## Three in a Row\n## Subtract on a Hundred Chart\n# Money and Coin Problems\n## Ways to Make $1.00","[{\"question\":\"What topics are covered in the enrichment answer key?\",\"answer\":\"It covers ordinal numbers, number position writing, comparing numbers, 2-digit addition and subtraction using a hundred chart, pattern explanations, and coin/money tasks such as making $1.00.\"},{\"question\":\"How are students guided to add 2-digit numbers in these pages?\",\"answer\":\"They use a hundred chart strategy, starting from a given number and moving right or down to add specific tens and ones, then marking the chart to show how the sum was found.\"},{\"question\":\"How does the subtraction activity use the hundred chart?\",\"answer\":\"Students subtract by marking where the difference lands on the hundred chart, following directions to move up specific rows for tens and move left for ones, then checking the resulting difference.\"},{\"question\":\"What is the money task about and what coins are allowed?\",\"answer\":\"Students must find all different ways to make $1.00 using only quarters, dimes, and nickels, recording each combination in a table.\"}]","Harcourt Math - Check What You Know Enrichment Answer Key | PDF",1791875479]