Ch.4 Skills Bank
Textbook
6 Math Nelson
Chapter
Chapter 4
Section
Ch.4
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Solutions 60 Videos

Use mental math to calculate.

500-290

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Q1a

Use mental math to calculate.

1200 - 750

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Q1b

Use mental math to calculate.

600 + 1575

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Q1c

Use mental math to calculate.

2499 + 501

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Q1d

Use mental math to calculate.

399 + 299 + 199

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Q1e

Use mental math to calculate.

5000 - 1775

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Q1f

Use mental math to calculate.

5500 + 4500 + 2000

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Q1g

Use mental math to calculate.

7100-98

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Q1h

Use mental math to calculate.

2550 + 2450 + 2010

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Q1i

Explain how knowing 1000 + 2000 = 3000 can help you solve each problem.

a) A plane flew 999 km to one city and 2001 km to another city. What is the total distance the plane flew?

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Q2a

Explain how knowing 1000 + 2000 = 3000 can help you solve each problem.

b) A container holds 3000 mL of juice. 1001 mL of juice is poured out. How many millilitres are left in the container?

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Q2b

Use mental math to determine the missing number. Describe your strategy.

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Q3a

Use mental math to determine the missing number. Describe your strategy.

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Q3b

Use mental math to determine the missing number. Describe your strategy.

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Q3c

Use mental math to determine the missing number. Describe your strategy.

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Q3d

Use estimation to decide which answers are reasonable. Correct the unreasonable answers.

5679 + 2457 = 8136

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Q4a

Use estimation to decide which answers are reasonable. Correct the unreasonable answers.

987+304+723+815=1829

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Q4b

Use estimation to decide which answers are reasonable. Correct the unreasonable answers.

56767+45283=102050

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Q4c

Use estimation to decide which answers are reasonable. Correct the unreasonable answers.

3045 - 283 = 2762

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Q4d

Use estimation to decide which answers are reasonable. Correct the unreasonable answers.

12080 - 3479=7601

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Q4e

Use estimation to decide which answers are reasonable. Correct the unreasonable answers.

54213 - 24618 = 39595

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Q4f

In 2004, as part of the Kids Can Vote project, elementary and secondary students in Canada voted online in the federal election. The chart shows the voting results for Ontario.

a) Estimate how many students voted in the election. Show your work.

b) Estimate the difference in votes between the Liberals and the Greens. Show your work.

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Q5

Estimate and calculate. Show your work.

145 + 289 + 365

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Q6a

Estimate and calculate. Show your work.

763+201+437+675

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Q6b

Estimate and calculate. Show your work.

999+999+999+999

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Q6c

Estimate and calculate. Show your work.

876+459+888+555

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Q6d

Estimate and calculate. Show your work.

457+235+608+236

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Q6e

Estimate and calculate. Show your work.

910+192+367+843

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Q6f

Calculate the perimeter of each shape. Show your work.

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Q7a

Calculate the perimeter of each shape. Show your work.

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Q7b

The chart shows the number of public schools in Toronto.

a) How many more schools are in the Toronto District Public School Board than in the Toronto Catholic District School Board?

b) Explain how you know that your answer is reasonable.

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Q8

Calculate. Determine if your answers are reasonable. Show your work.

a) 10 000 - 476

b) 2345 - 906

c) 30 000 - 5619

d) 65 300 - 2366

e) 35 005 - 6521

f) 98 301 - 6725

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Q9

An arena seats 20 000 people. The chart shows the number of people in each section.

a) How many empty seats are in the arena?

b) Explain how you know your answer is reasonable.

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Q10

A powwow was attended by 12 459 people. Of these people, 1086 were participants. How many people were not participants?

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Q11

Use mental math to calculate. Describe your strategy for two of your answers.

1.79 + 2.1

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Q12a

Use mental math to calculate. Describe your strategy for two of your answers.

3.50 + 2.25

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Q12b

Use mental math to calculate. Describe your strategy for two of your answers.

6.79 + 2.21

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Q12c

Use mental math to calculate. Describe your strategy for two of your answers.

6.99 + 3.25

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Q12d

Use mental math to calculate. Describe your strategy for two of your answers.

6.00 - 2.75

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Q12e

Use mental math to calculate. Describe your strategy for two of your answers.

10.00 - 4.99

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Q12f

Use mental math to calculate. Describe your strategy for two of your answers.

6.25 - 1.98

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Q12g

Use mental math to calculate. Describe your strategy for two of your answers.

4.000 - 1.999

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Q12h

Madison used a $20 bill to pay for a $1.96 drink and a $3.55 sandwich. Use mental math to calculate the change she received. Show your work.

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Q13

Joshua’s height was 1.655 m on his 12th birthday and 1.800 m on his 13th birthday. Use mental math to calculate how much he grew in that year. Show your work.

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Q14

Calculate. Determine if your answers are reasonable. Show your work.

1.45 + 2.38

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Q15a

Calculate. Determine if your answers are reasonable. Show your work.

6.666 + 7.77

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Q15b

Calculate. Determine if your answers are reasonable. Show your work.

15.099 + 3.771

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Q15c

Calculate. Determine if your answers are reasonable. Show your work.

0.765 + 0.238

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Q15d

Calculate. Determine if your answers are reasonable. Show your work.

3.457 + 0.9

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Q15e

Calculate. Determine if your answers are reasonable. Show your work.

3.55 + 4.8 + 2.089

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Q15f

What is the total mass of the rice?

Rice bag 1 - 0.876 kg

Rice bag 2 - 1.248 kg

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Q16

a) What was the total precipitation in Seymour Fall, B.C., in January and February?

b) How much more precipitation is needed in March to equal 1 m ?

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Q17

Calculate. Show your work.

1.00 - 0.65

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Q18a

Calculate. Show your work.

2.000 - 0.877

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Q18b

Calculate. Show your work.

10.000 - 4.762

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Q18c

Calculate. Show your work.

2.145 - 0.9

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Q18d

Calculate. Show your work.

4.666 - 1.999

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Q18e

Calculate. Show your work.

32.085 - 15.396

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Q18f

Use addition to check one answer in Question 18.

Show your work.

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Q19

The diagram shows the boundaries of a nature park. Amelia is at sign 1. She wants to see the beaver dam at sign 4.

a) How much farther will she have to walk along the park boundaries than along the road?

b) Are your calculations reasonable? Explain.

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Q20