BASIC 1 MATHEMATICS QUESTION 16

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 10s) 
Identify the correct skip count, errors and omissions by skip counting by 10s backwards.
 
Example:
70, 61, 50, 41, 31
Correct Skip Count: 70, 60, 50, 40, 30
Error: 61, 41, 31
Omissions: 60, 40, 30
 
Now solve the following:

 
1. 50, 41, 31, 20, 11
Correct Skip Count:
Error:
Omissions:
 
2. 70, 60, 51, 41, 30, 21, 10
Correct Skip Count:
Error:
Omissions:
 
3. 91, 80, 71, 60, 51, 41, 30, 21
Correct Skip Count:
Error:
Omissions:
 
4. 100, 91, 81, 70, 61, 51, 40
Correct Skip Count:
Error:
Omissions:
 
5. 110, 101, 91, 80, 71, 60, 51
Correct Skip Count:
Error:
Omissions:
 
6. 140, 131, 121, 110, 101, 90, 81
Correct Skip Count:
Error:
Omissions:
 
7. 150, 140, 131, 121, 111, 100, 91
Correct Skip Count:
Error:
Omissions:
 
8. 240, 231, 221, 210, 200, 190
Correct Skip Count:
Error:
Omissions:

1. 50, 41, 31, 20, 11
Correct Skip Count: 50, 40, 30, 20, 10
Error: 41, 31, 11
Omissions: 40, 30, 10
 
2. 70, 60, 51, 41, 30, 21, 10
Correct Skip Count: 70, 60, 50, 40, 30, 20, 10
Error: 51, 41, 21
Omissions: 50, 40, 20
 
3. 91, 80, 71, 60, 51, 41, 30, 21
Correct Skip Count: 90, 80, 70, 60, 50, 40, 30, 20
Error: 91, 71, 51, 41, 21
Omissions: 90, 70, 50, 40, 20
 
4. 100, 91, 81, 70, 61, 51, 40
Correct Skip Count: 100, 90, 80, 70, 60, 50, 40
Error: 91, 81, 61, 51
Omissions: 90, 80, 60, 50
 
5. 110, 101, 91, 80, 71, 60, 51
Correct Skip Count: 110, 100, 90, 80, 70, 60, 50
Error: 101, 91, 71, 51
Omissions: 100, 90, 70, 50
 
6. 140, 131, 121, 110, 101, 90, 81
Correct Skip Count: 140, 130, 120, 110, 100, 90, 80
Error: 131, 121, 101, 81
Omissions: 130, 120, 100, 80
 
7. 150, 140, 131, 121, 111, 100, 91
Correct Skip Count: 150, 140, 130, 120, 110, 100, 90
Error: 131, 121, 111, 91
Omissions: 130, 120, 110, 90
 
8. 240, 231, 221, 210, 200, 190
Correct Skip Count: 240, 230, 220, 210, 200, 190
Error: 231, 221
Omissions: 230, 220