Envisions Grade 4 Topic 4

Multiplying by Powers of Ten

100

24 x 10

240

200

100 x 37

3,700

300

45 x 1,000

45,000

400

19 x 10

190

500

100 x 62

6,200

Estimating Products

100

Estimate 3 x 51

Answer: 3 x 50 = 150

200

Estimate 48 x 23

Answer: 50 x 20 = 1,000

300

Estimate 67 x 295

Answer: 70 x 300= 21,000

400

Estimate 556 x 42

Answer: 600 x 40= 24,000

500

Estimate 191 x 733

Answer: 200 x 700=  140,000

Multipliying by2 digit numbers

100

Daily Double: correct answers are worth double the points.

21 x 40

Answer:840

200

Bonus

Free 200 points

300

58 x 32

Answer: 1,856

400

36 x 25

Answer: 900

500

17 x 64

Answer: 1,088

Word Problems

100

Sarah has 23 boxes of chocolates, and each box contains 47 chocolates. How many chocolates does she have in total? |

Answer: 1,081 chocolates

200

Estimate the total cost if each toy costs $48 and John buys 23 toys.

Answer: 50 x 20= $1,000

300

A factory produces 45 toys per hour. How many toys will they produce in 1,000 hours?

Answer: 45 x 1,000= 45,000 toys

400

There are 19 books on each shelf, and there are 10 shelves. How many books are there in total?

Answer: 19 x 10= 190 books

500

A farmer plants 62 rows of crops, with 100 plants in each row. How many plants are there in total?

Answer: 62 x 100= 6,200 plants