### Teaching and Group Activities for Understanding

**Day 1 Teaching**

Remind Y5 how to use the grid method to multiply 3-digit numbers by 1-digit numbers, and how to round to approximate answers.

**Further Teaching with Y6**

Write 5 × 2326, 4 × 3943, 6 × 2082 and ask children to estimate which will have the largest answer. Model estimating and also short multiplication; draw comparisons.

**Group Activities: T with Y6**

Y5 -- Whole year group investigation: work in groups to find the 3-digit × 1-digit multiplication with the biggest and smallest answers.

Y6 -- Move from using the grid method to short multiplication, using ‘friendly’ digits. Investigate arranging the digits in a multiplication to give the largest answer, then the smallest.

**Day 2 Teaching**

Teach Y5 short multiplication (3-digit × 1-digit), comparing with grid multiplication. Show Y6 examples, 4-digit by 1-digit. Tell Y5 this is the same method, just with more digits.

**Group Activities: T with Y5**

Y5 -- Multiply using short multiplication. Identify ranges of multiples of 100 for multiplications and say which multiple of 100 will be nearer.

Y6 -- Write multiplications with answers in given ranges. Estimate which multiplications will give the smallest and largest answers and use short multiplication to find exact answers.

**Day 3 Teaching**

Use short multiplication to estimate how many drinks and meals might be consumed in a year.

**Further Teaching with Y6**

Use short multiplication to find the cost of three presents (4-digit prices).**Group Activities: T with Y6**

Use the in-depth problem-solving investigation for this unit ‘Excellent eights’ as today’s group activity.

Or, use these activities:

Y5 -- Use the grid method and short multiplication to multiply 3-digit by 1-digit numbers.

Y6 -- Estimate and calculate the exact cost of buying 3 items (3-digit prices). Some children will calculate target spends between £50 and £100.

**Day 4 Teaching**

Model using the grid method to multiply 2-digit numbers by teens numbers, then by numbers between 20 and 30, stressing what is being calculated on each row.

**Group Activities: T with Y5**

Y5 -- Partition rectangles to find areas, link to the grid method. Multiply 2-digit numbers by 24 using the grid method.

Y6 -- Multiplication investigation swapping 1s digits of 2-digit numbers.

**Day 5 Teaching**

Consolidate setting out the grid method to multiply pairs of 2-digit numbers. Discuss which will have largest/smallest answer.**Further Teaching with Y6**

Discuss and show how to use the grid method to calculate 17 × 234 and 27 × 234. Children then find 43 × 345.**Group Activities: T with Y6**

Y5 -- Create multiplications of 2-digit numbers with answers in given ranges.

Y6 -- Use the digits 3, 4 and 5 in any order to make a 3-digit number and multiply it by 16, then 26. Create multiplications with a target answer of 15,000.