Learning objectives
- Recognise, explain, and apply “γραπτοί αλγόριθμοι”.
- Recognise, explain, and apply “προπαίδεια”.
- Recognise, explain, and apply “υπόλοιπο στη διαίρεση”.
Greek Primary Grade 3 / Mathematics / Αριθμοί και πράξεις
Τέσσερις πράξεις: structured theory, worked examples, answered practice, and a mastery checklist for Greek Primary Grade 3.
Unit
The essential chapter ideas in a clear sequence before practice.
Calculus studies how a quantity changes and how small changes accumulate. Graphical interpretation should accompany the notation.
Mathematics
Start with theory and core examples, then move to worked exercises and short test-style practice.
The structure follows the official textbook layout and is used to organise study.
The areas that usually create mistakes or need extra revision.
Check domain, continuity, or differentiability where required. A correct rule cannot be applied mechanically outside its conditions.
A derivative represents local rate of change and a definite integral represents net accumulation. Always reconnect the result to the original problem.
Use a suitable representation, state the rule, and keep every numerical or algebraic step equivalent. Finish with estimation, an inverse operation, or substitution as a check.
Use a suitable representation, state the rule, and keep every numerical or algebraic step equivalent. Finish with estimation, an inverse operation, or substitution as a check.
Use a suitable representation, state the rule, and keep every numerical or algebraic step equivalent. Finish with estimation, an inverse operation, or substitution as a check.
Mathematics
Follow the method step by step and check why every step is valid.
2 equal groups contain 7 objects each. How many objects are there, and how can the answer be checked?
14
Explain “γραπτοί αλγόριθμοι” in your own words and use a picture, objects, a table, or a simple measurement to support it.
A complete explanation connects the correct idea, a clear representation, and a sensible check.
Τέσσερις πράξεις
Eight graded tasks from core fluency to exam-style application. Work independently before opening a hint or answer.
Calculate 4 + 2 and show two representations connected with “γραπτοί αλγόριθμοι”.
Use a number line, place value, or objects.
4 + 2 = 6. Valid representations include number-line jumps and grouped objects.
4 equal groups contain 7 objects each. Find the total and write an addition and multiplication statement.
Add 7 a total of 4 times.
7 + 7 + 7 + 7 = 4 · 7 = 28.
Continue 3, 9, 15, ... for three more terms and explain the rule.
Check how much each term increases.
21, 27, 33; +6.
A rectangle has sides 6 cm and 3 cm. Find its perimeter and explain why four sides are counted.
Opposite sides are equal.
Perimeter = 6 + 3 + 6 + 3 = 18 cm.
Out of 45 objects, 9 are shaded. What fraction is shaded and how does it simplify?
Put shaded objects over the total.
9/45 = 1/5.
The measurements are 5, 2, 5, and 2. Find the greatest, least, and range.
Range = greatest value minus least value.
Greatest 5, least 2, range 3.
Anna has 32 cards, gives away 8, then shares the rest into 3 equal groups. How many are in each group?
Subtract first, then divide.
32 - 8 = 24; (24) : 3 = 8.
A learner says 4 + 6 = 11. Find the error, correct it, and check the correction.
Check with a number line or inverse subtraction.
4 + 6 = 10; 10 - 6 = 4.
Τέσσερις πράξεις
Six distinct assignments from core fluency to challenge, each with an estimated time, hint, and answer guide.
Homework 1: Calculate 7 + 3 and show two representations connected with “γραπτοί αλγόριθμοι”.
Use a number line, place value, or objects.
7 + 3 = 10. Valid representations include number-line jumps and grouped objects.
Homework 2: 5 equal groups contain 3 objects each. Find the total and write an addition and multiplication statement.
Add 3 a total of 5 times.
3 + 3 + 3 + 3 + 3 = 5 · 3 = 15.
Homework 3: Continue 6, 8, 10, ... for three more terms and explain the rule.
Check how much each term increases.
12, 14, 16; +2.
Homework 4: A rectangle has sides 9 cm and 4 cm. Find its perimeter and explain why four sides are counted.
Opposite sides are equal.
Perimeter = 9 + 4 + 9 + 4 = 26 cm.
Homework 5: Out of 30 objects, 5 are shaded. What fraction is shaded and how does it simplify?
Put shaded objects over the total.
5/30 = 1/6.
Homework 6: The measurements are 8, 3, 8, and 3. Find the greatest, least, and range.
Range = greatest value minus least value.
Greatest 8, least 3, range 5.
35 minutes / 30 marks
A timed, full-mark self-assessment with model-answer guidance.
Start the timer when ready, work without notes, show every step, and open model answers only after finishing.
1. Calculate 5 + 3 and show two representations connected with “γραπτοί αλγόριθμοι”.
2 marks5 + 3 = 8. Valid representations include number-line jumps and grouped objects.
2. 5 equal groups contain 8 objects each. Find the total and write an addition and multiplication statement.
3 marks8 + 8 + 8 + 8 + 8 = 5 · 8 = 40.
3. Continue 4, 6, 8, ... for three more terms and explain the rule.
3 marks10, 12, 14; +2.
4. A rectangle has sides 7 cm and 4 cm. Find its perimeter and explain why four sides are counted.
4 marksPerimeter = 7 + 4 + 7 + 4 = 22 cm.
5. Out of 18 objects, 3 are shaded. What fraction is shaded and how does it simplify?
4 marks3/18 = 1/6.
6. The measurements are 6, 3, 6, and 3. Find the greatest, least, and range.
4 marksGreatest 6, least 3, range 3.
7. Anna has 45 cards, gives away 9, then shares the rest into 4 equal groups. How many are in each group?
5 marks45 - 9 = 36; (36) : 4 = 9.
8. A learner says 5 + 2 = 8. Find the error, correct it, and check the correction.
5 marks5 + 2 = 7; 7 - 2 = 5.
Unit
Curriculum reference sources. Always confirm the teaching sequence with the school and tutor.
Where to start: textbook, daily material, PDFs, videos, and worked examples.
Targeted practice before full tests so coverage is clear.
How to measure progress in this chapter and when it enters a cumulative mock.
What to do after finishing the chapter and how it connects to the next unit.
Note: for the official examinable syllabus of each school year, always confirm with the school, tutor, and current Ministry/IEP announcements.