Numbers ending in 7, 8 or 9 are just below a round number. Add the round number instead — that is easy — and then take back the little bit you added too much.
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 2 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 2 min 30 s.
🏅 Sign in with Google to earn the
🎯 Round-Up Racer badge when you pass — and a certificate when you finish all 5 lessons of
Part 1 · Speed adding & subtracting. You can still take the test without signing in.
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