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Addition and Subtraction Unit 1Whole Class Teaching Input DAY 1Objectives Use written addition to add pairs of 4-digit numbers.ResourcesMini-whiteboards and pens.TeachingWrite 3458 + 2477, 3478 + 2827 and 3455 + 2327 on the board. Which do you think will have the biggest answer and which do you think will have the smallest answer? Ask chn to talk to their partner and agree an order without working out the answers. Take feedback about how they did this. Draw out how each could be rounded to the nearest 1000 to give an approximation, in which case the first and last would have the same approximation. Discuss how each could be rounded to the nearest 100, and then knowledge of adding pairs of 2-digit numbers be used to find more accurate approximations. 3458 + 2477: 3500 + 2500 = 60003478 + 2827: 3500 + 2800 = 63003455 + 2327: 3500 + 2300 = 5800Model working through the first addition, carefully talking through each stage, e.g. 8 and 7 is 15, write 5 in the 1s column and 1 in the 10s column. Remind chn to leave a blank row below the second number and write the extra 10s, 100s and 1000s here so they don't forget to add them in when adding digits in the next column. 3 4 5 8+ 2 4 7 7 1 1 . 5 9 3 5Split the class into 2 groups and ask each 1 to work out 1 of the other 2 additions (the second one is more difficult than the third).Group activity notes DAY 1 Group activity notes DAY 1Discuss which additions of 4-digit numbers are easy/quick to do and which are harder /slower to do and why. Adding 5-digit numbers. Objectives: Use written addition to add pairs of 4-digit numbers and pairs of 5-digit numbers.Objectives: Use written addition to add pairs of 4-digit numbers and pairs of 5-digit numbers.You will need: Flipchart and pen.You will need: Flipchart and pen.Group of 6 – with TA or T Working at ARE /Working towards AREWrite 2321 + 2001, 2789 + 5428, 4321 + 2211, 8478 + 6945, 2349 + 3218, 3758 + 2785 on the flipchart. Ask chn to discuss in pairs which they think might be the easiest or quickest to answer and why. Take feedback. Draw out that 2321 + 2001 does not need a written method. 4321 + 2211 will be easy to work out as there will be no extra 10s, 100s or 1000s to add. Some chn may choose not to use a written method for this addition either. Repeat for the most difficult or slowest to work out. Discuss how additions as 8478 + 6945 will produce an extra 10, 100 and 1000, because each pair of digits comes to more than 10. Ask chn to work out the answer to each. Go round and support chn. Remind them to leave a blank row below the second number and write the extra 10s, 100s and 1000s here so they don't forget to add them in when adding digits in the next column.For children who are struggling, rehearse the column addition with place value equipment, perhaps using expanded version. Group of 6 – with T or TA Working at Greater DepthWrite 24,456 + 18,345 on the flipchart. Explain that we can use same method to work out the calculation as we do for adding pairs of 4-digit numbers, we just have more digits! Work through the calculation together, carefully talking through the addition of the digits in the 1000s column, giving 12,000, so we need to write 2 in the 1000s column and 1 in the 10,000s column. 2 4 4 5 6+ 1 8 3 4 5 1 1 1 . 4 2 8 0 1Ask chn to use digits 0 to 9 to create two 5-digit numbers between 30,000 and 40,000 and find the total. What are the biggest answer they can make and the smallest?Outcomes: I can use column addition to add any pair of 4-digit numbers.Outcomes: I am beginning to use column addition to add pairs of 5-digit numbers.Whole Class Teaching Input DAY 2Objectives Use written addition to add pairs of 5-digit numbers.ResourcesTable of hits on a website (see resources).TeachingShow the table of hits on a website over the week (see resources). Roughly how many people visited the website on Sunday (am and pm)? Discuss rounding to the nearest thousand, and adding the 2-digit numbers of 1000s (36,000 and 57,000). Show chn how to use column addition to add the 2 numbers on Sunday. Carefully talk through the addition of the digits in the 1000s column, and the writing of 1 in the 10,000s column. 3 6 4 3 2+ 5 7 4 7 8 1 1 1 . 9 3 9 1 0Repeat for the total number of hits on Monday. Group activity notes DAY 2 Group activity notes DAY 2Use the in-depth problem-solving investigation for this unit – Exasperating 80 Grand – as today’s group activity, or use the activities below.Use a place value chart to generate 5-digit numbers to add. Use digits 1 to 8 to create two 4-digit numbers, aiming for a total between 6000 and 8000. Objectives: Use written addition to add pairs of 4-digit numbers and pairs of 5-digit numbers.Objectives: Use written addition to add pairs of 4-digit numbers and pairs of 5-digit numbers.You will need: Place value chart (see resources), red and blue counters, flipchart, red and blue pens.You will need: 0 to 8 digit cards.Group of 6 – with T or TA Working at ARE /Greater DepthShow the place value chart (see resources) and cross out 60,000, 70,000, 80,000 and 90,000. Ask 1 child to place a red counter on a number in each column and write the resulting 5-digit number on the flipchart in red pen. Ask another child to do the same using blue counters and blue pen under the red number. Work together to find the total, making sure that chn understand the place value of each pair of digits being added. Repeat with other chn.Challenge some more confident children to work without crossing out the numbers above 50,000. In pairs – independent or with TA Working towards AREAsk chn to use digits 1 to 8 to create two 4-digit numbers. They can only use each digit once in the pair of numbers. Challenge them to aim for the pair of numbers to have a total between 6000 and 8000. After a while discuss how chn are choosing where to place the digits. Which digits can you use in the 1000s column? Is it possible to use 3 and 2 in the 1000s column and still get a total between 6000 and 8000? If you used 3 and 2 in the 1000s column, what would the 100s digits need to add up to?How many pairs of numbers with a total of between 6000 and 8000 can they find? Outcomes: I am beginning to use column addition to add pairs of 5-digit numbers.Outcomes: I can use column addition to add any pair of 4-digit numbers.I can approximate answers.ADDITIONAL RESOURCESMini-whiteboards and pensFlipchart and pen Table of hits on a website (see resources)Place value chart (see resources)Red and blue countersRed and blue pens0 to 8 digit cardsThe links to the websites and the contents of the web pages associated with such links specified on this list (hereafter collectively referred to as the ‘Links’) have been checked by Hamilton Trust (being the operating name of the registered charity, William Rowan Hamilton Trust) and to the best of Hamilton Trust’s knowledge, are correct and accurate at the time of publication. Notwithstanding the foregoing or any other terms and conditions on the Hamilton Trust website, you acknowledge that Hamilton Trust has no control over such Links and indeed, the owners of such Links may have?removed such Links, changed such Links and/or contents associated with such Links. Therefore, it is your sole responsibility to verify any of the Links which you wish you use. Hamilton Trust excludes all responsibility and liability for any loss or damage arising from the use of any Links. ................
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