BASIC 1 MATHEMATICS QUESTION 12

Strand 1:  NUMBER

Sub-Strand 1:  Number: Counting, Representation, Cardinality & Ordinality
CONTENT STANDARDS 1: Describe numbers and the relationship between numbers 0 to 100
INDICATORS AND EXEMPLARS 1: Use number names, counting sequences and how to count to find out “how many?”
 
E.g. 1.  Count by 1s (forwards and backwards) between two given numbers between 0 and 100; or by 2s and 10s; Identify and correct errors or omissions in counting or skip counting sequences 
 
Question focus: Identifying and correcting errors and omissions in counting or skip counting sequences (skip counting backwards by 1s)
  
Identify the correct skip count, errors and omissions by skip counting by 1s backwards.
 
Example:
10, 7, 6, 5, 41
Correct skip count: 10, 9,8,7,6, 5, 4
Error: 41 (This is because when you skip counting backwards by 1s you only subtract, and from the numbers given, when you subtract 1 from 5 it is 4)
Omissions: 9, 8 (This is because when skip counting backwards by 1s, the next numbers after 10 is 9, 8 and not 7)
 

Now solve the following questions;

1.  9, 81, 7, 6, 5, 41, 3, 21, 1
Correct skip count:
Error:
Omissions:
 
2. 11, 8, 71, 6, 51, 4
Correct skip count:
Error:
Omissions:
 
3. 14, 10, 91, 8, 71, 6, 52
Correct skip count:
Error:
Omissions:
 
4. 20, 16, 151, 141, 13, 12
Correct skip count:
Error:
Omissions:
 
5. 25, 23, 221, 21, 201, 19
Correct skip count:
Error:
Omissions:
 
6. 30, 26, 251, 24, 231, 22
Correct skip count:
Error:
Omissions:
 
7. 35, 31, 301, 29, 281, 27
Correct skip count:
Error:
Omissions:
 
8. 40, 391, 35, 341, 33, 321
Correct skip count:
Error:
Omissions:
 
9. 50, 46, 451, 44, 431, 42
Correct skip count:
Error:
Omissions:
 
10. 60, 591, 58, 571, 53, 52
Correct skip count:
Error:
Omissions:

1. 9, 81, 7, 6, 5, 41, 3, 21, 1
Correct skip count: 9, 8, 7, 6, 5, 4, 3, 2, 1
Error: 81, 41, 21
Omissions: 8, 4, 2

2. 11, 8, 71, 6, 51, 4
Correct skip count: 11, 10, 9, 8, 7, 6, 5, 4
Error: 71, 51
Omissions: 10, 9

3. 14, 10, 91, 8, 71, 6, 52
Correct skip count: 14. 13. 12. 11, 10, 9, 8, 7, 6, 5
Error: 91, 71, 52
Omissions: 13, 12, 11

4. 20, 16, 151, 141, 13, 12
Correct skip count: 20, 19, 18, 17, 16, 15, 14, 13, 12
Error: 151, 141
Omissions: 19, 18, 17

5. 25, 23, 221, 21, 201, 19
Correct skip count: 25, 24, 23, 22, 21, 20, 19
Error: 221, 201
Omissions: 24

6. 30, 26, 251, 24, 231, 22
Correct skip count: 30, 29, 28, 27, 26, 25, 24, 23, 22
Error: 251, 231
Omissions: 29, 28, 27

7. 35, 31, 301, 29, 281, 27
Correct skip count: 35, 34, 33, 32, 31, 30, 29, 28, 27
Error: 301, 281
Omissions: 34, 33, 32

8. 40, 391, 35, 341, 33, 321
Correct skip count: 40, 39, 38, 37, 36, 35, 34, 33, 32
Error: 391, 341, 321
Omissions: 38, 37, 36

9. 50, 46, 451, 44, 431, 42
Correct skip count: 50, 49, 48, 47, 46, 45, 44, 43, 42
Error: 451, 431
Omissions: 49, 48, 47

10. 60, 591, 58, 571, 53, 52
Correct skip count: 60, 59, 58, 57, 56, 55, 54, 53, 52
Error: 591, 571
Omissions: 56, 55, 54