Let’s solve this Mental Math Crossnumber Puzzle step by step. We’ll go clue by clue, calculate each answer carefully, and then we can fill in the grid (though you only asked for the answers — so we’ll list them clearly).
We’ll start with ACROSS clues first, then DOWN.
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ACROSS:
1.
500,000 - 750
→ 500,000 minus 750 = 499,250
✔️ Check: 500,000 - 700 = 499,300; then subtract 50 more → 499,250
4.
Halve 492
→ Half of 492 = 492 ÷ 2 = 246
✔️ Check: 200 + 200 = 400, 46 + 46 = 92 → yes, 246
6.
Two tenths of 70
→ Two tenths = 2/10 = 0.2
→ 0.2 × 70 = 14
✔️ Or: one tenth of 70 is 7, so two tenths is 14
7.
1000 - 88
→ 1000 - 80 = 920; 920 - 8 = 912
✔️ Answer: 912
9.
Increase 300,000 by 1%
→ 1% of 300,000 = 3,000
→ 300,000 + 3,000 = 303,000
✔️ Correct
10.
½ of 84
→ 84 ÷ 2 = 42
✔️ Easy!
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DOWN:
1.
11 × 4 × 10
→ First, 11 × 4 = 44
→ Then 44 × 10 = 440
✔️ Done
2.
75 less than 1000
→ 1000 - 75 = 925
✔️ Think: 1000 - 100 = 900, but we only subtracted 75, so add back 25 → 925
3.
350,000 ÷ 70
→ Divide both by 10: 35,000 ÷ 7 = 5,000
✔️ Because 7 × 5,000 = 35,000 → so original is 5,000
5.
Double 336
→ 336 × 2 = 672
✔️ 300×2=600, 36×2=72 → 672
6.
50% of 320
→ 50% means half → 320 ÷ 2 = 160
✔️ Simple
7.
8,999,960 + 100
→ Add 100: 8,999,960 + 100 = 9,000,060
✔️ Just bump up the hundreds place: 960 + 100 = 1,060 → carry over → becomes 9,000,060
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Now let’s double-check any that might be tricky:
- Clue 9 Across: Increase 300,000 by 1% → 1% is 3,000 → total 303,000
✔
- Clue 7 Down: 8,999,960 + 100 → yes, 960 + 100 = 1,060 → so it becomes 9,000,060
✔
- Clue 3 Down: 350,000 ÷ 70 → divide numerator and denominator by 10 → 35,000 ÷ 7 = 5,000
✔
All calculations check out.
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Final Answer:
ACROSS:
1. 499250
4. 246
6. 14
7. 912
9. 303000
10. 42
DOWN:
1. 440
2. 925
3. 5000
5. 672
6. 160
7. 9000060
Parent Tip: Review the logic above to help your child master the concept of 6th grade math worksheet puzzles.
