20 minutes, then stopCostume 2 + correctionsSun 18 October1 / 4
Choose one of these two
1 Food 2 Pokémon — do sheet 1 or sheet 2, then everyone does 3 and 4
Name Date
1 · Food — the price of onePrice of one = total price ÷ number of pieces. When packs hold different numbers, compare the price of one to see which is the better buy.
Example · already workedA pack of 15 sweets costs 735 yen. How much is one?
① Estimate: 15 x 50 = 750 yen → about 50 yen each
② 735 ÷ 15 = 49 → 49 yen
1Doughnuts: 12 for 636 yen. How much is one?
12 x 50 = 600. 636 is a little more than that.
2Cookies: pack A is 14 for 658 yen, pack B is 25 for 1,150 yen. First say "both are about 50 yen each", then work out the price of one in long division and say which is cheaper and by how many yen.
When the estimate cannot decide it (the gap is small), calculate properly.
3Juice costs 38 yen a bottle. With 1,000 yen, how many bottles can you buy, and how much change is left?
Money too little for another bottle is the change.
2 · Pokémon — a move that does doubleIf a move does double damage, how does the number of hits change? The numbers are made up.
A remainder means one more hit.
Example · already workedHP left 180. A normal move does 30 per hit; a super-effective move does double. How many hits with the super-effective move?
① Double → 30 x 2 = 60
② 180 ÷ 60 = 3 → 3 hits (a normal move would need 180 ÷ 30 = 6 hits)
1HP left 372. A normal move does 24 per hit. Round 24 to 20 and say your estimate first, then work out in long division how many more hits are needed.
Rounding 24 down to 20 makes each hit look weaker, so the estimate runs high.
2The super-effective move does 48 per hit (double the normal move). HP left is 372. How many more hits? Is it exactly half the number of hits for the normal move?
3HP left 250. Each hit does a whole number from 21 up to (but not including) 30. Find the fewest and the most hits it could take.
The biggest damage is 29 (less than 30).
3 · From here, everyone
4Work out 905 ÷ 37 in long division.
37 → 40. Two 40s fit into 90.
5Round 38,527 to the nearest thousand.
The hundreds digit is 5. Which way does exactly 5 go?
6There are 100 pencils. They go in boxes of one dozen (12). How many full boxes can you make, and how many pencils are left? And how many boxes are needed to hold all 100?
"Boxes you can fill" and "boxes to hold everything" treat the remainder differently.
4 · Corrections, and one puzzle problem
7Pick one question you got wrong this week from your notebook and do it again.
- Which question (day and number)
- Why you got it wrong (estimate / multiplying / subtracting / remainder / other)
Once you can do it the second time, that question is finished.
8Sum and difference — Two children have 58 sweets between them. A has 12 more than B. How many does each have?
Draw bars. A's bar is 12 longer than B's. Take off the 12 and the two bars are equal: 58 − 12 = 46, split in two.
9Someone answered 200 ÷ 32 as "5 remainder 40". What is wrong? Write the correct answer.
The same mistake as Tuesday's remainder that was bigger than the divisor.