Activity 2: Maths in our minds (90 minutes) Students revise pairs of numbers that add to ten, and use this knowledge to perform mental calculations in a shopping context. Resource 1: Secrets Plastic or cut-out currency (Resource 2). Each of three students needs six $10 notes and ten $1 coins. Resource 5: Ten frames (optional – only for students who require them) Pen and paper for recording a tally (optional – one copy per three students) Worksheet 2: Mental market receipts (one copy per three students) Assessment Tasks: Formative There is an assessment rubric immediately following this table. This can help teachers to monitor student progress throughout the unit. The rubric indicates the activities and worksheets that allow students to demonstrate each assessed skill. Activity 3: Counting change (30 minutes) Students practise 'counting on' to calculate change. Resource 1: Secrets Plastic or cut-out currency (Resource 2). A variety of and notes up to $10, including at least four $2 coins and at least one 5c, 10c and 50c coin Student computers Digital resource: Activity 4: Addition tricks (60 minutes) Students learn to use the 'split strategy' and the 'compensation strategy' to perform addition in the context of shopping. They model each strategy using notes and coins. Plastic or cut-out currency (Resource 2). Each group of three students needs six $10 notes and ten $1 coins. Video demonstrating split strategy for addition: (for teacher reference) Video demonstrating the compensation strategy: (for teacher reference) Worksheet 3: Receipts for addition tricks (one copy per three students) Worksheet 4: Practising addition tricks (one copy per student) Activity 5: Subtraction tricks (75 minutes) Students learn to use the split strategy and the compensation strategy in the context of shopping. They model each strategy using notes and coins. Plastic or cut-out currency (Resource 2). Each group of three students needs six $10 notes and ten $1 coins. Worksheet 5: Calculations for subtraction tricks (one copy per three students) Worksheet 6: Practising subtraction tricks (one copy per student)
The student can 'count on' to calculate change. Represent money values in multiple ways and count the change required for simple transactions to the nearest five cents (ACMNA059) Activities 3, 8 and 9 The student accurately counts change. The student accurately counts change, with some prompting to on'. The student requires assistance to correctly calculate change. The student uses the strategy to add two-digit costs. Apply place value to partition, rearrange and regroup numbers to at least 10 000 to assist calculations and solve problems (ACMNA053) See ACMNA055 above. Activities 4, 8 and 9 Worksheets 3 and 4 The student provides the correct answer and can model the strategy using concrete materials. The student provides the correct answer but requires assistance in setting up concrete materials to support the operation. The student requires substantial assistance to find the answer. The student uses the compensation strategy to add costs. See ACMNA055 Activities 4, 8 and 9 Worksheets 3 and 4 The student provides the correct answer and can model the strategy using concrete materials. The student provides the correct answer but requires assistance in setting up concrete materials to support the operation. The student requires substantial assistance to find the answer. The student uses the strategy to subtract two-digit costs. See ACMNA053 above. See ACMNA055 above. Activities 5, 8 and 9 Worksheets 5 and 6 The student provides the correct answer and can model the strategy using concrete materials. The student provides the correct answer but requires assistance in setting up concrete materials to support the operation. The student requires substantial assistance to find the answer.
The student uses the compensation strategy to subtract two-digit costs. See ACMNA055 Activities 5, 8 and 9 Worksheets 5 and 6 The student provides the correct answer and can the strategy using concrete materials. The student provides the correct answer but requires assistance in setting up concrete materials to support the operation. The student requires substantial assistance to find the answer. The student understands the doubling and halving strategy for multiplication. Represent and solve problems involving multiplication using efficient mental and written strategies and appropriate digital technologies (ACMNA057) Activities 7, 8 and 9 The student can demonstrate the strategy with concrete material and can fill in missing numbers in a given double and halving strategy. With minimal prompting, the student can demonstrate the strategy with concrete materials and can fill in missing numbers in a given double and halving strategy. The student requires assistance to demonstrate the strategy with concrete materials and/or to provide missing numbers in a double and halving strategy. The student can demonstrate an understanding of ATM and EFTPOS transactions, by calculating account balances. See ACMNA055 above. See ACMNA059 above. Activities 6, 8 and 9 Worksheet 7 The student correctly calculates account balances transactions including transactions involving 'cash out'. The student correctly calculates account balances after transactions with minimal prompting. The student requires assistance to calculate account balances after transactions.
Solutions for Worksheet 1: Are you ready? 1. a. 50c b. 30c c. 20c d. $27 e. $33 f. $24 g. 36c h. 65c i. 32c j. $62 k. $26 l. $33 2. a. $8 b. $12 c. 50c 3. a. $8 b. $7 c. 50c 4. a. $10 b. 20c c. 20c Solutions for Worksheet 2: Mental market receipts Note that receipts are numbered across the page. Stage 1: 1. $40 2. $60 3. $40 4. $30 5. $40 6. $50 7. $60 8. $40 9. $70 10. $80 11. $80 12. $100 13. $50 14. $70 15. $60 Stage 2: 1. $5 2. $7 3. $6 4. $3 5. $9 6. $3 7. $4 8. $2 9. $8 10. $9 11. $6 12. $7 13. $17 14. $23 15. $38
Solutions for Worksheet 3: Receipts for addition tricks Note that receipts are numbered across the page. Trick 1: 1. $38 2. $49 3. $38 4. $53 5. $58 6 $56 7. $56 8. $59 9. $68 10. $97 11. $78 12. $94 13. $77 14. $89 15. $79 Trick 2: 1. $24 2. $26 3. $33 4. $42 5. $54 6. $41 7. $52 8. $57 9. $63 10. $64 11. $74 12. $81 13. $104 14. $125 15. $145 Solutions for Worksheet 4: Practising addition tricks 1: a. 64 b. 76 c. 87 d. 58 e. 85 f. 98 Trick 2: a. 34 b. 41 c. 62 d. 73 e. 74 f. 62 Solutions for Worksheet 5: Calculations for subtraction tricks Trick 1: a. $13 b. $14 c. $14 d. $14 e. $32 f. $41