Trick-or-Treat 10 and 100
Find 40 X 7
280
Find 3 X 50= ?
Show your work.
150
Please break apart 67 X 5=
Show your work
60 + 7
(60 X 5) + (7 X 5)
= 335
Break apart to find 7 X 53 =
Show your work.
1. Substitute 53 for 50 to multiply more easily.
2. 7 X 50 = 350
3. Adjust. Add 7 groups of 3.
350 + 21 = 371
Round to the nearest tens without showing your work and write the answer ONLY!
3 X 473 =?
3 X 480 = 1440
Find 230 X 6 =
1380
6 X 380 =?
Show your work.
2280
Break apart and show your work and the answer.
Question:
👻 36 × 4 =
36 × 4=
=(30 × 4) + (6 × 4)
= 120 + 24 = 144
In H X 120 = 960, H is a one-digit number. What number does H represent?
H represents 8!
Round to determine if 9 X 83 is greater than or less than 620. Explain how you decided.
83 rounding down to 80
9 X 80 ~ 720
720 is less than 620.
Draw an array to represent 2 X 10
🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃
🎃🎃🎃🎃🎃🎃🎃🎃🎃🎃
How many zeros will the product of 2 X 400=?
Explain why.
2 zeros because 400 has 2 zeros.
There are 52 haunted houses on a ghost street. Each house has 2 glowing pumpkin windows. How many glowing windows are there in total?
There are 104 glowing windows 🪟
Witch's Trick or Treat Challenge (Estimate then Solve)
First, estimate the product using rounding or mental strategies, then solve exactly.
97 × 6 → Estimate: ____ / Exact: ____
Estimate: 600
Exact: 582
A spider is spinning webs in the haunted forest. She spins 74 webs every night, and each web catches about 9 flies.
Using ROUNDING, about how many flies does the spider catch in one night?
Round 74 to 70
Multiply: 70×9=630
The 🕷️ catches about 630 flies each night.
Charlie went to a Halloween party and got 9 candies from 10 different people. How many candies did he get?
90 Candies
Connor said the product of 2 X 3000 will have 3 zero. Is he correct? Explain.
He is correct. The product have 3 zeros from 3000.
Ayla is building haunted chairs for a Halloween party. Each haunted chair has 7 creepy wooden slats across its back. If Ayla wants to make 24 haunted chairs for the ghostly guests, how many creepy slats does she need in total?
Please show your work.
Ayla needs 168 creepy slats in total. 🎃👻
7 X 24 =168
Mental Magic
Use your mental math skills to find the missing factor:
___ × 7 = 280
show ONLY answer
40 × 7 = 280
So, the missing number is 40. 🎃
🧹 Jayde has to fly her broomstick 462 miles to visit the enchanted forest. If she makes 2 round-trip flights, about how many miles will she fly in total?
Use rounding to find an estimate.
1. Round 462 to 460
2. Multiply: 460×2= 920
3. She does round trip so 920 X 2= 18040
So, Maya will fly about 1,840 miles in total.
Huxley has 10 groups of chocolate with 3 in each group. Kylie has 6 groups of chocolate with 6 in each group. Who has more chocolate?
Kylie has more chocolate because 6 X 6= 36 and while 3 X 10= 30.
Suzie has 80 times as many Halloween costumes as Frankie. If Frankie has 9 costumes, how many costumes does Suzie have?
Suzie will have 720 costumes.
True or Boo!
Decide whether the equation is correct. If it’s wrong, explain why and fix it.
👻 134 × 3 = (100 × 3) + (30 × 3) + (4 × 3)=
300 + 90 + 9 = 399
→ True or Boo?
👻 BOO 👻
4 X 3 = 12 NOT 9
Miss Lu was helping at the haunted pumpkin patch. She needed to pack 37 pumpkins into crates, with 4 pumpkins in each crate.
To solve 37 × 4 quickly, she rounded 37 down to 30. Then, Miss Lu added 7 groups of 4, saying: 120 + 7 = 127. So, Miss Lu said she would need 127 pumpkins in total.
What did Miss Lu do incorrectly in her strategy?
Miss Lu correctly rounded 37 down to 30 and multiplied:(30×4=120), (30×4=120)
Since she rounded down by 7 bags, she needed to add back 7 groups of 4 candies, NOT JUST 7 candies.
7 groups of 4 candies is:7×4=28
So the correct total should be:
120+28=148
🧛 Hendrix, the vampire, crafts 989 coffins every month. He crafts coffins for 8 months.
Estimate the total number of coffins made in 8 months by rounding to the nearest ten and multiplying.
Round 989 to 990
990×8=6,300
Conner makes about 7,920 coffins in 9 months.