Learn the 40 Times Table
The 40 times table can be built from a simple mental-math skill: double, double again, then multiply by 10.
Learn 40 × 1 through 40 × 12, connect multiplication by 40 with the 4 times table, and use the same reasoning to solve larger calculations without memorizing every product.
Start with 7. Double to 14, double again to 28, then multiply by 10: 28 × 10 = 280.
40 Times Table Chart
Work through the multiplication table of 40 from 40 × 1 to 40 × 12 and look for connections with doubling and the 4 times table.
Interactive practice
40 Times Table
Learn the 40 times table from 1 to 12, practice the facts you miss, then test your speed.
Multiplication chart
40 Times Table Chart
| Calculation | Answer |
|---|---|
| 40 × 1 | 40 |
| 40 × 2 | 80 |
| 40 × 3 | 120 |
| 40 × 4 | 160 |
| 40 × 5 | 200 |
| 40 × 6 | 240 |
| 40 × 7 | 280 |
| 40 × 8 | 320 |
| 40 × 9 | 360 |
| 40 × 10 | 400 |
| 40 × 11 | 440 |
| 40 × 12 | 480 |
Memory helper
See the pattern
Practice mode
Build accuracy
What is
Speed test
How many can you answer?
Answer as many 40 times table questions as you can before the timer ends.
Speed question
Double Twice to Build a ×40 Answer
Multiplying by 4 is the same as doubling twice. Once you have that result, multiplying by 10 turns the calculation into multiplication by 40.
Here, 6 is doubled to 12 and doubled again to 24. Making 24 ten times as large gives 240, so 40 × 6 = 240.
Turn a 4 Times Table Fact Into a ×40 Fact
Since 40 = 4 × 10, every product in the 40 times table is ten times the corresponding product in the 4 times table.
Find the familiar multiplication fact first.
32 × 10 gives 320.
If you already know the 4 times table, multiplication by 40 adds a place-value step to facts you have already learned.
Follow the Sequence From 40 to 480
Consecutive products in the 40 times table are separated by exactly 40. This makes nearby facts useful when an answer does not come to mind immediately.
Know that 40 × 7 = 280? Add 40 to get 40 × 8 = 320. From 40 × 10 = 400, subtract 40 to find 40 × 9 = 360.
The Last Two Digits Follow a Repeating Pattern
As you move through consecutive multiples of 40, the final two digits cycle through a recognizable five-step pattern.
For example, 40 × 3 and 40 × 8 are five positions apart, and both products end in 20. The cycle is useful as a quick reasonableness check, although it is better to understand the calculation than to memorize the endings separately.
Turn a ×20 Answer Into a ×40 Answer
Forty is twice twenty. That means a product from the 20 times table can be doubled to produce the corresponding ×40 product.
If 40 × 9 = 360, half of 360 is 180. Therefore, 20 × 9 = 180.
Remember the Special Product 40 × 25 = 1,000
Some products are particularly useful because they create round numbers. One worth recognizing is 40 × 25 = 1,000.
Multiplying 25 by 4 creates a convenient 100.
Therefore, 40 × 25 = 1,000.
This benchmark can make related calculations easier. Doubling it gives 40 × 50 = 2,000, while four groups of 1,000 give 40 × 100 = 4,000.
Multiply Larger Numbers by 40
Repeated doubling and the ×4 then ×10 method are not limited to the first twelve facts. They can be applied to larger numbers too.
Double 24 to get 48, double again to get 96, then multiply by 10. Therefore, 40 × 24 = 960.
Practice More Multiplication Facts
Mixed practice helps you decide when doubling, a known table fact or another mental-math strategy is the quickest route to an answer.
Start times table practice →40 Times Table Practice Questions
Solve each question before revealing the answer. Try repeated doubling first if you do not recall the product immediately.
What is 40 × 4? Show answer
Use repeated doubling to find 40 × 6. Show answer
If 20 × 7 = 140, what is 40 × 7? Show answer
If 40 × 8 = 320, what is 40 × 9? Show answer
What is 40 × 11? Show answer
What is 40 × 12? Show answer
Can You Apply the ×40 Strategy to New Numbers?
These products are designed to test the method rather than simple recall. Double twice or calculate ×4, then use the ×10 step.
What is 40 × 15? Show answer
What is 40 × 25? Show answer
What is 40 × 50? Show answer
What is 40 × 100? Show answer
40 Times Table Questions
Review the main products and the mental-math relationships behind multiplication by 40.
What is the 40 times table?
From 40 × 1 to 40 × 12, the products are 40, 80, 120, 160, 200, 240, 280, 320, 360, 400, 440 and 480.
What is 40 × 5?
40 × 5 = 200.
What is 40 × 6?
40 × 6 = 240.
What is 40 × 7?
40 × 7 = 280. One method is 7 → 14 → 28, followed by 28 × 10 = 280.
What is 40 × 8?
40 × 8 = 320.
What is 40 × 9?
40 × 9 = 360.
What is 40 × 10?
40 × 10 = 400.
What is 40 × 11?
40 × 11 = 440.
What is 40 × 12?
40 × 12 = 480.
What is an easy way to multiply by 40?
Double the other factor twice and then multiply the result by 10. For example, for 40 × 7: 7 → 14 → 28, then 28 × 10 = 280.
Why is 40 × 25 equal to 1,000?
Since 4 × 25 = 100 and 40 is ten times 4, 40 × 25 is ten times 100: 1,000.
What are the first 12 multiples of 40?
The first 12 positive multiples of 40 are 40, 80, 120, 160, 200, 240, 280, 320, 360, 400, 440 and 480.