Cleo the time traveller is back in 1855 at Mary Seacole’s British Hotel in Crimea, exploring and helping Mary with her maths problems. This time, she will need help to add 2-digit numbers with exchanges.
More resources for Autumn Block 2 Step 12.
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Discussion points for teachers
1. Help Cleo to turn the numbers as words into numerals and use the blank bar model to complete the calculation.
Discuss how the numbers would be written as numerals. Discuss adding 32 and 19 and use of exchange. Discuss where the numbers would go on the bar model.
2. How many fresh sheets will Mary have once they are all clean and dry?
Discuss how many sheets are drying. Discuss how many sheets need washing. Discuss writing this as a linear calculation. Discuss methods or equipment that could be used to calculate this such as using Base 10 or column method.
45 + 37 = 82
3. Help Cleo decide how many more bottles could be added without overloading the mule’s saddle.
Discuss the starting number on the part-whole model. Discuss the different amounts that could be added while staying within the parameters given. This question is open-ended for the children to explore.
Any number up to 31 could be added without overloading the saddle.
4. Check Mary’s calculation and explain whether she is correct.
Discuss whether Mary has put the correct numbers into the bar model. Discuss methods to check the answer. Discuss what the correct answer should be.
Mary is incorrect as she has incorrectly added 68 and 25. The bar model should show 93.
National Curriculum Objectives
Mathematics Year 2: (2C4) Solve problems with addition and subtraction using concrete objects and pictorial representations, including those involving numbers, quantities and measures applying their increasing knowledge of mental and written methods
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