Addition and Subtraction
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Level contents
- * Assessment for the whole of Level 4
- ** Assessment test answers
- *** Assessment test records
- 4:01 Addition and subtraction
- Complete 2 digit subtraction and addition algorithms, decimals and problems. Use calculator to check answers. Discuss other ways to check answers..
- 4:01E Addition and subtraction
- Extension page. Years and place value. 3 and 4 line addition algorithms. Doubling and near doubling strategy practice. Write 5 two-digit numbers that total under 100. Write 4 two-digit numbers that subtract from 60 leaving zero. Fill in the missing numbers.
- 4:02 Addition and subtraction
- Addition and subtraction algorithms, trading. Calculate and compare distances.
- 4:03 Addition and subtraction strategies
- Match each question to the position of its answer on the number line. Fill in the missing number. Use the split strategy and the jump strategy.
- 4:04 Inverse operations
- Complete algorithms and check using inverse operation. Check answers to given questions using a calculator and inverse operation.
- 4:05 Addition, 3 digits, no trading
- 3-digit number addition algorithms, no trading.
- 4:05E Addition of more than two numbers
- Extension page. Multi-line additions of 3-digit numbers, with and without trading.
- 4:05PT Progress test
- Test of Addition and Subtraction
- 4:06 Addition with one trade
- Addition with one trade, using concrete materials, if needed. Check answers using inverse operations.
- 4:07 Subtraction, 3 digits, no trading
- Write the number represented by Base 10 blocks and subtract 120. Complete algorithms. Write a number story.
- 4:08 Subtraction with trading
- Complete algorithms and use jump or split strategy to check.
- 4:08C Subtraction with trading
- Complete algorithms and use jump or split strategy, or inverse operations, to check.
- 4:09 Rounding to estimate answers
- Round numbers to nearest 10, add estimates. Find area by estimating and then adding actuals. Complete algorithms manually or using a calculator and check answers by rounding.
- 4:09C Addition and rounding
- Addition practice and rounding to the nearest 10, 100, 1000.
- 4:10 Addition, 3 digits, one trade
- Addition, 3 digits, one trade.
- 4:11 Addition, 3 digits
- Addition, 3 digits, trading. Problem solving.
- 4:11E Addition of four numbers
- Extension page. Estimate and add multiple line algorithms with trading. Explore changing a calculator display. Estimate how many days you've been alive. Write an algorithm to find exact number.
- 4:12 Addition with two trades
- Complete addition algorithms and problems that have 2 trades.
- 4:12PT Progress test
- Test of Addition and Subtraction
- 4:13 Addition with trading
- Complete 3-digit addition algorithms and problems that require trading.
- 4:13E Addition up to five numbers
- Extension page. Practise adding up to 5 numbers with trading. Make number sentences.
- 4:14 Addition strategies
- Practise addition strategies - Bridging decades, changing order of addends, compensation strategy
- 4:14E Mental strategies for addition
- Extension page. Mental addition using jump strategy, bridging decades, associative strategy, compensation strategy.
- 4:15 Subtraction, 3 digits, one trade
- Complete 3-digit subtractions with one trade and make up number stories. Complete algorithms and check using jump strategy.
- 4:16 Subtraction with trading
- Complete 3-digit subtractions, with trading, including money. Complete problems.
- 4:16C Subtraction with trading
- Complete 3-digit subtractions with trading.
- 4:16EA Adding millilitres and litres
- Extension page. Add litres and millilitres.
- 4:16EB Shopping
- Extension page. Find change by counting on. Find totals and change. Spend $5.
- 4:17 Estimating with addition
- Estimate answer by rounding to nearest 100 and complete. Complete algorithm and check by rounding. Find an estimate, then use a calculator to complete.
- 4:18 Estimating with subtraction
- Estimate answers to subtractions by rounding and complete. State reasonableness of answer. Complete algorithms and estimate to check. Estimate answers and check with a calculator.
- 4:19 Addition and subtraction strategies
- Use jump, split and patterns strategies to add and subtract.
- 4:20 Addition and subtraction
- Complete addition and subtraction questions and check using inverse operation. Circle incorrect answers to given algorithms and write correct answers.
- 4:20C Addition and subtraction
- Complete addition and subtraction questions and check using inverse operation. Write the missing numbers in given algorithms to get correct answers.
- 4:20E Addition
- Extension page. Complete algorithms, looking for tens. State what the questions could be about e.g. temperatures, heights. Write algorithms for headings e.g. length of fingers on left hand.
- 4:21 Subtraction from 100s
- Explore ways to subtract from hundreds - decomposition, working mentally, part decomposition, equal addends.
- 4:22 Subtraction from 100s
- Practise ways to subtract from hundreds - decomposition, working mentally, part decomposition, equal addends.
- 4:22C Giving change
- Count on, using the jump strategy, to find change.
- 4:22PT Progress test
- Test of Addition and Subtraction
- 4:23 Addition, 4 digits, no trading
- 4 digit addition without trading. Convert from grams to kilograms, or between millilitres and litres. Practise mental addition.
- 4:23C Speed tests
- Addition and subtraction speed tests. Record results in a table.
- 4:24 Subtraction, 4 digits, no trading
- Practise subtracting 4 digits without trading. Practise mental subtraction.
- 4:25 Addition, 4 digits, with trading
- Practise adding 4 digits with trading, including distances.
- 4:25E Adding up to four numbers
- Extension page. Practise adding up to 4 numbers. Find the missing numbers. Replace shapes with numbers and complete. Which 4 numbers add to given total?
- 4:26 Subtraction algorithm, trading
- Complete subtraction algorithms and problems, with trading.
- 4:27 Subtracting from thousands
- Subtract from thousands using the 1999 + 1 method or a quick trade method.
- 4:27C Subtraction
- Trade 1 thousand for 10 hundreds and complete subtraction algorithms and problems.
- 4:27PT Progress test
- Test of Addition and Subtraction