Subtract Next Ten then Add Back — Timed Practice (8 Q)

Subtract the next ten, then add back the extra (usually +1)!

78 − 19 = ?

Hint (use THIS question as the example): Subtract the next ten, then add back the extra.

Tip: For numbers ending with 9, the “extra” is usually 1 (e.g., 39 → next ten 40, extra 1).

⏰ Time’s up — Answer: —

Press Try Again to practice (no marks), or Next to move on.

Score: 0 / 8

Nice work! Next ten → add back extra.

Progress

🟩 correct on first try (scores) | 🟧 correct after a wrong try (0 mark) | 🟥 time up (0 mark)

Math Buddy

Timed mode

Find the next ten, subtract it, then add back the extra (usually +1).

Total score

0 / 8

Time: 25s

✅ Correct (first try) = confetti + auto next (2s)
❌ Any wrong try = 0 mark for that question
⏰ Time up = answer revealed + Try Again (practice)

Quick Steps

Next Ten → Add Back

Step 0: Find the next ten after the second number (e.g., 39 → 40).

Step 1: Subtract that next ten from the first number.

Step 2: Add back the extra (next ten − second number).

Tip: If the second number ends with 9, the extra is usually 1.