L4Teacher's Notes Topic: Number & Algebra

Number Grids

What is the rule to work out the arrowed numbers?

12

10

20

2

Here are the rules for a number grid.

12

Use the rules to write the missing numbers in these number grids.

12

10

24

94 710

What changes could we make?change the numberschange the operationschange the shapeis there always a unique solution for the last type of grid?could use algebra use percentages - eg find the left number as a percentage of the right

Blank grids are provided

Number GridsHere are the rules for a number

grid.

2

20

10

12This number is the sum of the numbers in the middle row

This number is the product of the numbers in the middle row

What is the rule to work out the arrowed numbers?

Use the rules to write the missing numbers in these number grids.

74 9

12

24

10