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Activity 1

Add 1-digit to a  2-digit numbers, using known facts

 

For this activity you will need a 100 square

 

Looking at the 100 square, ask your child to find the number 14.

Together count on 3 and say the answer.

Record 14 + 3 = 17.

Repeat for 24 + 3 = 27 

34 + 3 = 37

 

Discuss the pattern and establish that if we know 4 + 3, we can work out any number ending in 4 + 3.

Ask your child to write three more additions.

Now can they find the number patterns on the worksheet, “Using Number Patterns”

Key questions:

  • To work out 44 + 3 do we need to count on in 1s? What number fact can we use?

  • If we know 5 + 3 is 8, what else can we work out really easily?

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Parents: Please encourage your child to look for the pattern in the answers, i.e only the first (tens digit) changes each time, the last digit (ones digit) stays the same.

 

Challenge:

Ask a grown-up to write a number fact in the middle of a piece of paper, e.g. 5 + 3 = 8

What adding sums can you work out using this fact?

Write them on the paper e.g. link 5 + 3 = 8, 15 + 3 = 18, 25 + 3 = 28, 35 + 3 = 38, and 45 + 3 = 48 

Can you use some really big numbers, like 105 + 3 = 108 for example?

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