TGB: related facts
Starter- I’m thinking of a number
My number is ten more than 15. What is my number? 25
My number is ten more than 22. What is my number? 32
My number is ten more than 39. What is my number? 49
My number is ten less than 26. What is my number? 16
My number is ten less than 84. What is my number? 74
My number is ten less than 51. What is my number? 41
Here are some questions for you to have a go at.
E.g. If I know 5 + 4 = 9, then I know 50 + 40 = 90
If I know 3 + 5 = 8, then I know 30 + 50 = 80
If I know 2 + 4 = 6, then I know 20 + 40 = 60
If I know 2+ 7 = 9, then I know 20 + 70 = 90
If I know 1 + 3 = 4, then I know 10 + 30 = 40
Here are some questions for you to have a go at.
E.g. If I know 10 – 3 = 7, then I know 100 – 30 = 70.
If I know 5 – 2 = 3, then I know 50 – 20 = 30
If I know 9 – 5 = 4, then I know 90 – 50 = 40
If I know 6 – 1 = 5, then I know 60 – 10 = 50
If I know 4 – 3 = 1, then I know 40 – 30 = 10
Eva has 2 red pens and 3 blue pens. How many pens does she have altogether? 5
Tommy has 20 red pens and 30 blue pens. How many pens does he have altogether? 50
Challenge
Miss Lotysz starts writing a pattern.
1 + 9 = 10
2 + 8 = 10
3 + 7 = 10
4 + 6 = 10
5 + 5 = 10
6 + 4 = 10
7 + 3 = 10
8 + 2 = 10
9 + 1 = 10
Can you finish the pattern off for her?
What do you notice about this pattern?
All the answers equal 10. The first number counts forwards in 1 and the second number counts backwards.
Did you spot any other patterns?
Challenge
Miss Lotysz starts writing a pattern.
10 + 90 = 100
20 + 80 = 100
30 + 70 = 100
40 + 60 = 100
50 + 50 = 100
60 + 40 = 100
70 + 30 = 100
80 + 20 = 100
90 + 10 = 100
Can you finish the pattern off for her?
What do you notice about this pattern?
All the answers equal 100. The first number is counting forwards in 10 and the second number is counting backwards in 10.
Did you notice any other patterns?
Extra challenge
Miss Lotysz thinks if 3 + 1 = 4, then 30 + 10 = 400, because I have added two zeroes on, is she correct? Explain your answer.
She is incorrect because, she only needed to add 1 zero to make 30 + 10 = 40.
I wonder could you share your maths work with me. OR any other maths activities you have been working on during your time away from school. You never know, you might make an appearance on our blog!