Teaching and Group Activities for Understanding
Day 1 Teaching
Demonstrate how to add 197 to 4735, using an empty number line jotting to show the addition of 200 and a hop back of 3 as we have added 3 too many. Now subtract 197 by subtracting 200 and adding 3 back on. This is our technique to add/subtract nearly numbers (near multiples of 10, 100, 1000). Repeat, adding and subtracting 1995 to/ from 4735.
-- Use place value to add and subtract multiples and near multiples of 100 and 1000.
Day 2 Teaching
Use place value to add and subtract; add and subtract near multiples of 100, 1000 and 10,000. Sketch an empty number line jotting to show subtracting 1000, then subtracting 998, adding 2 back on as we have subtracted too much, etc.
-- Use place value to add and subtract near multiples of 100, 1000 and 10,000.
Day 3 Teaching
Write these additions on the board: 4267 + 2784 + 3832, 8723 + 5265, 23,451 + 18,325 and 67,342 + 8,352. Ask children to discuss in pairs which they think will have the biggest answer and the smallest answer. Give reasons. Model rounding, followed by column addition to check.
Use the ‘Triple trouble’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
-- Use column addition to add a combination of 4-digit and 5-digit numbers.