7. If an addend is increased and the other is kept the same, the sum increases by the same amount
The seventh lesson on number, addition and subtraction, aimed at Year 5 and 6 pupils, in a series produced by the NCETM during the school closures period in summer 2020. For a full list of lessons aimed at all primary school age-groups, go to ncetm.org.uk/primaryvideolessons