In the table of values the numbers are on top.
Doubling means: the number plus itself. Write the double underneath.
Example: On top is 40,000. Double that is 40,000 + 40,000 = 80,000, so you write 80,000 underneath.
With big numbers splitting helps: for double 250,000 you calculate 200,000 + 200,000 = 400,000 and 50,000 + 50,000 = 100,000. Together that is 500,000.
The numbers written in show the answer.
Example
| 30000 | 125000 | 340000 |
| 60000 | 250000 | 680000 |
For parents
What does this exercise practice?
Confidently double large values too and enter them clearly in a table.
Common pitfalls
Children sometimes put the answer in the wrong column. It helps to trace with a finger from top to bottom.
How to practice at home
Draw a small table at home with ten thousand and hundred thousand numbers and fill in the doubles together.
Related: Multiplying, Divided By, Number Sentences with a Gap