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Addition and subtraction on a number line links between the model and appropriate ‘vertical’ method Janine Blinko

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421-273

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421-273 421 -200 221 In which case they need to be fluent in subtracting multiples of 100 from any number…… Equivalent written recording-formal version 421- 273 221 -200

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421-273 and fluent in subtracting multiples of 10 from any number including crossing the hundreds boundaries…… Equivalent written recording-formal version 421- 273 221 -200 151 -70 421 -200 221 -70 151

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421-273 -3 148 421 -200 221 -70 151 Equivalent written recording-formal version 421- 273 221 -200 151 -70 148 -3

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91-68 +2 68 91 +1 23 +20 70 90

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It is 11.25. My cake will be ready at 1.15. How long do I have to wait before it is ready? +5 mins 11.25 1.15 +1 hour 1hour 55 minutes +30 mins 11.30 +15 mins 1.00 12.00

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421-273 +7 273 421 +100 148 +20 280 +21 400 300 Equivalent written recording- formal version 421- 273 7 280 20 300 100 400 21 421 148

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421-273 -3 148 421 -200 221 -70 151 Equivalent written recording-formal version 421- 273 221 -200 151 -70 148 -3

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421-273 -3 148 421 -200 221 -70 151 Equivalent written recording- formal version 421- 273 221 -200 151 -70 148 -3

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148+273

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148+273 148 +200 348 In which case they need to be fluent in adding multiples of 100 to any number…… Equivalent written recording-formal version 148+ 273 348 +200

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148+273 148 +200 348 and fluent in adding multiples of 10 to any number including crossing the hundreds boundaries…… +70 418 Equivalent written recording-formal version 148+ 273 348 +200 418 +70

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148+273 148 +200 348 +70 418 +3 421 Equivalent written recording-formal version 148+ 273 348 (+200) 418 (+70) 421 (+3)

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