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Activity 1

Adding three 1-digit numbers 

 

Show your child these calculations:-

8 + 5 + 5                      7 + 9 + 3                    6 + 4 + 6                   5 + 2 + 9

 

Explain that you need to find the total score in each calculation. Look at the first one. Discuss how you could solve this by starting with 8, then counting on 5 (crossing 10), then adding 5 (Hold 8 in your head and count on using your fingers). But there might be a quicker way. Ask your child to think about another way of adding the numbers.

Try to spot the pair to 10 (also a double) 5 + 5 = 10 

And ten add eight is? That was quick! Complete the addition: 5 + 5 + 8 = 18

 

Repeat with the next two calculations, using the bonds to 10 to make the addition easier. 

 

7 + 9 + 3                      7 + 3 = 10        10 + 9 =19 

 

6 + 4 + 6              6 + 4 = 10            10 + 6 = 16   (OR using known doubles)     6 + 6 = 12       12 + 4 = 16

 

Ask your child to look at the fourth calculation. This time there is no double or pair to 10. Discuss how best to add these three numbers. 

Remind your child that they should start by adding onto the largest number. Add the numbers together starting with the largest number first, adding 5, then 2. Your child may know that 9 + 5 = 14 or that 9 + 2 = 11. They can then add the last number.

 

There are 3 accompanying worksheets to help your child practise these skills which become progressively more challenging. 

 

When your child is confident at applying their bonds to 10 to solve the calculations on the first and second worksheet you can move onto the third worksheet where they have to apply their knowledge of doubles to solve the calculations.

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