Cleo the time traveller has travelled back to the year 1853 to meet Mary Seacole. Mary needs some help to prepare for her trip to Crimea and to subtract 1-digit from 2-digits.
More resources for Autumn Block 2 Step 10.
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Discussion points for teachers
1. Help Cleo to work out how many nurses have been enrolled this week by writing the numbers in numerals and calculating the answer.
Discuss how many nurses were enrolled that week. Discuss how many nurses have fallen ill. Discuss writing these numerals into a calculation. Discuss how we need to exchange a ten for tens ones in order to take 7 away.
92 – 7 = 85
2. Please help me to work out which bottles to take. Discuss the method needed to subtract each 1-digit number from each 2-digit number.
Discuss equipment that could be used to help such as Base 10. Discuss the answer for each calculation. Discuss which medicine bottles contain the most liquid.
68 – 9 = 59; 63 – 4 = 59; 64 – 8 = 56; 61 – 6 = 55; 65 – 7 = 58. Mary should take bottles 1, 2 and 5.
3. How many clean bandages will I be able to take with me?
Discuss how many bandages Mary had to begin with. Discuss how many dirty bandages need to be taken away from the total. Discuss other methods which could be used to complete the calculation such as using a number line or Base 10. Discuss column method for this calculation.
72 – 9 = 63
4. How many can I take that don’t have holes?
Discuss the total number of sheets. Discuss how many sheets have holes. Discuss how Cleo has represented this in a bar model. Discuss how we would work out how many sheets Mary can take which don’t have holes.
53 – 5 = 48
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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