T2_C2_Day 6 Review (2)

How do we estimate the product of the factors that have DIFFERENT NUMBER OF DIGITS?

• We round off both the factors to the highest place value.

• We round off the factors to the highest place value of the higher factor.

• We do not round off the factors to the highest place value.

• We round off the factors to the highest place value of the smaller factor.

• 130 x 36

• 128 x 40

• 130 x 40

• 200 x 40

• 1,134

• 1,100

• 1,200

• 1,210

• Round 417 to 420 and multiply by 53

• Round 417 to 400 and multiply by 50

• Round 417 to 420 and multiply by 50

• Round 417 to 420 and multiply by 55

• 936

• 1,000

• 900

• 1,100

Each school pack costs ₱189, and the students plan to buy 78 packs. About how much will they spend altogether?

• ₱13,300

• ₱15,200

• ₱14,742

• ₱16,400

Each student makes 49 awareness posters, and 81 students are working together.
About how many posters will they make altogether?

• About 4,400 posters they will make altogether.

• About 3,969 posters they will make altogether.

• About 4,000 posters they will make altogether.

• About 3,000 posters they will make altogether.

Each garden row has 43 plants, and there are 17 rows. About how many plants are there in the garden?

• There are about 731 plants in the garden.

• There are about 800 plants in the garden.

• There are about 700 plants in the garden.

• There are about 820 plants in the garden.

Each student reads 537 pages in a week. There are 29 students in the reading club.
About how many pages did the students read in all?

• The students read about 15,573 pages in total.

• The students read about 15,500 pages in total.

• The students read about 16,200 pages in total.

• The students read about 16,500 pages in total.

If you want to estimate 645 × 73, which factors you should use for rounding before multiplying?

• 600 x 70

• 645 x 70

• 640 x 70

• 650 x 70