Two numbers between 11 and 19 can be multiplied in three quick steps. Add the ones digit of the second number to the first number, put a 0 after it, then add the two ones digits multiplied together.
Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
🏁 Lesson 9 test
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass — and beat the clock: finish within 3 min.
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🐯 Teen Tiger badge when you pass — and a certificate when you finish all 5 lessons of
Part 2 · Speed multiplying. You can still take the test without signing in.
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