STRAND 1: NUMBERS
(E.g. 1. Skip count forwards and backwards from 0 to 10,000 by 10s, 50s 100s, 500s and 1000s starting at any point. Identify and correct errors or omissions in a skip counting sequence)
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*Identifying and correcting errors in skip counting by 10s forwards and backwards
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Question focus: Identifying and correcting errors in skip counting by 10s backwards
QUESTION 7
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Example:
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100, 70, 61, 40, 31, 21, 11
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To find the errors, correct skip count and omissions follow the steps below;
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STEPS
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1. Write the correct skip count of the figures
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100, 90, 80, 70, 60, 50, 40, 30, 20, 10
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2. Find the omissions from the figures given.
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90, 80, 50 were omitted.
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3. Find the error (s) made from the figures
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Instead of 60, 30, 20 and 10, 61, 31, 21 and 11 were written and that makes them the error.
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Now, answer the following questions
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1. 140, 110, 100, 91, 80, 71, 60, 51
Correct Skip Count:
Omissions:
Errors:
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2. 130, 110, 90, 81, 70, 61, 50, 41, 30, 21
Correct Skip Count:
Omissions:
Errors:
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3. 90, 60, 51, 41, 30, 21, 10
Correct Skip Count:
Omissions:
Errors:
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4. 80, 60, 51, 40, 31, 20, 11
Correct Skip Count:
Omissions:
Errors:
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5. 200, 170, 160, 151, 130, 121, 110, 101
Correct Skip Count:
Omissions:
Errors:
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6. 280, 250, 241, 230, 221, 210, 200, 191, 180
Correct Skip Count:
Omissions:
Errors:
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7. 300, 260, 251, 240, 231, 220, 200, 191
Correct Skip Count:
Omissions:
Errors:
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8. 350, 310, 300, 291, 280, 250, 241, 230, 221, 210, 201
Correct Skip Count:
Omissions:
Errors:
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9. 290, 260, 251, 240, 231, 220, 210, 201, 190, 181
Correct Skip Count:
Omissions:
Errors:
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10. 480, 440, 431, 421, 410, 400, 391, 380, 370, 361, 350, 341, 330, 321
Correct Skip Count:
Omissions:
Errors:
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1. 140, 110, 100, 91, 80, 71, 60, 51
Correct Skip Count: 140, 130, 120, 110, 100, 90, 80, 70, 60, 50
Omissions: 130, 120
Errors: 91, 71, 51
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2. 130, 110, 90, 81, 70, 61, 50, 41, 30, 21
Correct Skip Count: 130, 120, 110, 100, 90, 80, 70, 60, 50, 40, 30, 20
Omissions: 120
Errors: 81, 61, 41, 21
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3. 90, 60, 51, 41, 30, 21, 10
Correct Skip Count: 90, 80, 70, 60, 50, 40, 30, 20, 10
Omissions: 80, 70
Errors: 51, 41, 21
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4. 80, 60, 51, 40, 31, 20, 11
Correct Skip Count: 80, 70, 60, 50, 40, 30, 20, 10
Omissions: 70
Errors: 51, 31, 11
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5. 200, 170, 160, 151, 130, 121, 110, 101
Correct Skip Count: 200, 190, 180, 170, 160, 150, 140, 130, 120, 110, 100
Omissions: 190, 180, 140
Errors: 151, 121, 101
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6. 280, 250, 241, 230, 221, 210, 200, 191, 180
Correct Skip Count: 280, 270, 260, 250, 240, 230, 220, 210, 200, 190, 180
Omissions: 270, 260
Errors: 241, 221, 191
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7. 300, 260, 251, 240, 231, 220, 200, 191
Correct Skip Count: 300, 290, 280, 270, 260, 250, 240, 230, 220, 210, 200, 190
Omissions: 290, 280, 270, 210
Errors: 251, 231, 191
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8. 350, 310, 300, 291, 280, 250, 241, 230, 221, 210, 201
Correct Skip Count: 350, 340, 330, 320, 310, 300, 290, 280, 270, 260, 250, 240, 230, 220, 210, 200
Omissions: 340, 330, 320, 270, 260
Errors: 291, 241, 221, 201
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9. 290, 260, 251, 240, 231, 220, 210, 201, 190, 181
Correct Skip Count: 290, 280, 270, 260, 250, 240, 230, 220, 210, 200, 190, 180
Omissions: 280, 270
Errors: 251, 231, 201, 181
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10. 480, 440, 431, 421, 410, 400, 391, 380, 370, 361, 350, 341, 330, 321
Correct Skip Count: 480, 470, 460, 450, 440, 430, 420, 410, 400, 390, 380, 370, 360, 350, 340, 330, 320
Omissions: 470, 460, 450
Errors: 431, 421, 391, 361, 341, 321
Correct Skip Count: 140, 130, 120, 110, 100, 90, 80, 70, 60, 50
Omissions: 130, 120
Errors: 91, 71, 51
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2. 130, 110, 90, 81, 70, 61, 50, 41, 30, 21
Correct Skip Count: 130, 120, 110, 100, 90, 80, 70, 60, 50, 40, 30, 20
Omissions: 120
Errors: 81, 61, 41, 21
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3. 90, 60, 51, 41, 30, 21, 10
Correct Skip Count: 90, 80, 70, 60, 50, 40, 30, 20, 10
Omissions: 80, 70
Errors: 51, 41, 21
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4. 80, 60, 51, 40, 31, 20, 11
Correct Skip Count: 80, 70, 60, 50, 40, 30, 20, 10
Omissions: 70
Errors: 51, 31, 11
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5. 200, 170, 160, 151, 130, 121, 110, 101
Correct Skip Count: 200, 190, 180, 170, 160, 150, 140, 130, 120, 110, 100
Omissions: 190, 180, 140
Errors: 151, 121, 101
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6. 280, 250, 241, 230, 221, 210, 200, 191, 180
Correct Skip Count: 280, 270, 260, 250, 240, 230, 220, 210, 200, 190, 180
Omissions: 270, 260
Errors: 241, 221, 191
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7. 300, 260, 251, 240, 231, 220, 200, 191
Correct Skip Count: 300, 290, 280, 270, 260, 250, 240, 230, 220, 210, 200, 190
Omissions: 290, 280, 270, 210
Errors: 251, 231, 191
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8. 350, 310, 300, 291, 280, 250, 241, 230, 221, 210, 201
Correct Skip Count: 350, 340, 330, 320, 310, 300, 290, 280, 270, 260, 250, 240, 230, 220, 210, 200
Omissions: 340, 330, 320, 270, 260
Errors: 291, 241, 221, 201
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9. 290, 260, 251, 240, 231, 220, 210, 201, 190, 181
Correct Skip Count: 290, 280, 270, 260, 250, 240, 230, 220, 210, 200, 190, 180
Omissions: 280, 270
Errors: 251, 231, 201, 181
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10. 480, 440, 431, 421, 410, 400, 391, 380, 370, 361, 350, 341, 330, 321
Correct Skip Count: 480, 470, 460, 450, 440, 430, 420, 410, 400, 390, 380, 370, 360, 350, 340, 330, 320
Omissions: 470, 460, 450
Errors: 431, 421, 391, 361, 341, 321
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