Draw 12 equal sized columns along the top of a piece of paper and write the numbers 1 through 12 at the top of each column. Then down the left side of the page, write the numbers 1 through 12 (1 starting at the top), drawing horizontal lines across the page between each number. This will create a grid that contains lots of boxes. In each box, follow the column up to the number written at the top (for example, 3) and then follow across to the number written at the side (for example, 5). Multiply these two numbers together (this example will be 15) and write it in the box --- it's OK to use a calculator. Do this until all numbers have been calculated and marked in the boxes. You now have all the answers to all the times tables from 1 through 12.
Look at the number 7 in the row of numbers down the left side of the page. Use a marker pen to mark each number in the horizontal row to the right of this number 7; the numbers marked will be 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77 and 84. These numbers are all the answers in order to the 7 times table.
Multiply any of the numbers along the top of the page (for example, the number 4) by 7, and you will find the answer by moving your finger from the top of that column down to the marked horizontal row. For this example, you will find the number 28 written in the box.
If you've memorized the 1 through 6 times tables, then you've already memorized the first half of the 7 times table. This is because when you multiply one number by another, it doesn't matter which number goes first or last (for example, 3 X 7 = 21, and 7 X 3 = 21 also). So if you can't remember what 7 X 6 equals, flip the number around in your mind so it becomes 6 X 7, and you'll remember that the answer is 42.