Sebastian the explorer has discovered a forgotten temple hidden in the jungle. He needs to use his knowledge of subtracting two 4-digit numbers to travel further inside.
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Discussion points for teachers
1.Use the key to work out the numbers to unlock the door.
Discuss what each value represents. Discuss what the answer looks like in digits and in symbols.
9,758 – 6,234 = 3,524
2.How much could Sebastian use to light the lamps?
Discuss what the possible answers could be. Discuss the smallest and greatest. This question is open-ended for the children to explore.
Various answers, for example: 6,999 – 2,356 = 4,643
3.To open the trap door, match the numbers to the correct calculation.
Discuss which numbers match which calculation. Discuss use of number bonds for mental calculation.
7,592 – 2,351 = 5,241; 8,863 – 4,521 = 4,342; 8,159 – 6,025 = 2,134; 6,347 – 2,303 = 4,044
4.Help Sebastian to work out the missing numbers so that he can carry on his journey into the temple.
Discuss linear layout of number sentence. Discuss how to identity missing values.
6,589 – 3,406 = 3,183
National Curriculum Objectives
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