BASIC 3 || MATHEMATICS || QUESTION 7

STRAND 1: NUMBERS

SUB-STRAND 1: Counting, Representation, Cardinality and Ordinality
CONTENT STANDARD 1: Counting and estimate quantities from 0 to 10 000
INDICATORS AND EXEMPLARS 1: Use number names and the counting sequence to count and estimate quantities up to 10,000.
 
(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)
 
*Identifying and correcting errors in skip counting by 10s forwards and backwards
 
Question focus: Identifying and correcting errors in skip counting by 10s backwards
 
QUESTION 7
 
Example:
 
100, 70, 61, 40, 31, 21, 11
 
To find the errors, correct skip count and omissions follow the steps below;
 
STEPS
 
1. Write the correct skip count of the figures
 
100, 90, 80, 70, 60, 50, 40, 30, 20, 10
 
2. Find the omissions from the figures given.
 
90, 80, 50 were omitted.
 
3. Find the error (s) made from the figures
 
Instead of 60, 30, 20 and 10, 61, 31, 21 and 11 were written and that makes them the error.
 
Now, answer the following questions
 
1. 140, 110, 100, 91, 80, 71, 60, 51
Correct Skip Count:
Omissions:
Errors:
 
2. 130, 110, 90, 81, 70, 61, 50, 41, 30, 21
Correct Skip Count:
Omissions:
Errors:
 
3. 90, 60, 51, 41, 30, 21, 10
Correct Skip Count:
Omissions:
Errors:
 
4. 80, 60, 51, 40, 31, 20, 11
Correct Skip Count:
Omissions:
Errors:
 
5. 200, 170, 160, 151, 130, 121, 110, 101
Correct Skip Count:
Omissions:
Errors:
 
6. 280, 250, 241, 230, 221, 210, 200, 191, 180
Correct Skip Count:
Omissions:
Errors:
 
7. 300, 260, 251, 240, 231, 220, 200, 191
Correct Skip Count:
Omissions:
Errors:
 
8. 350, 310, 300, 291, 280, 250, 241, 230, 221, 210, 201
Correct Skip Count:
Omissions:
Errors:
 
9. 290, 260, 251, 240, 231, 220, 210, 201, 190, 181
Correct Skip Count:
Omissions:
Errors:
 
10. 480, 440, 431, 421, 410, 400, 391, 380, 370, 361, 350, 341, 330, 321
Correct Skip Count:
Omissions:
Errors:
 

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
 
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
 
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
 
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
 
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
 
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
 
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
 
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
 
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
 
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