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Discover a trick right here that may assist you multiply a repdigit quantity lower than 100 by a single digit quantity in lower than 2 seconds so long as you recognize your multiplication desk.
What’s a repdigit quantity? A repdigit quantity is a quantity whose digits are the identical. For instance, 55 and 77 repdigit numbers.
What’s a single-digit quantity? A single-digit quantity is a quantity that has only one digit. For instance, 4 and eight are single-digit numbers.
The trick to observe is proven within the 3 examples under
Instance #1
44×9 = ?
Step 1: Multiply 4 by 9 to get 36. Write 36 down with an area between 3 and 6
Step 2: Add 3 and 6 to get 9
Step 3: Put 9 between 3 and 6.
44×9 = 396
Instance #2
88×5 = ?
Step 1: Multiply 8 by 5 to get 40. Write 40 down with an area between 4 and 0
Step 2: Add 4 and 0 to get 4
Step 3: Put 4 between 4 and 0.
88×5 = 440
Instance #3
99×9 = ?
Step 1: Multiply 9 by 9 to get 81. Write 81 down with an area between 8 and 1
Step 2: Add 8 and 1 to get 9
Step 3: Put 9 between 8 and 1.
99×9 = 891
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