Mastering Addition and Subtraction on Number Lines

What is the result of adding 22 to 47?

• 93

• 74

• 51

• 69

Why is adding 2 then 2 more to 47 incorrect for adding 22?

• It subtracts instead of adds.

• It starts from 74, not 47.

• It equals 69, not 51.

• It equals 51, not 69.

What mistake is made when starting the addition from 74 instead of 47?

• It only adds 2 instead of 22.

• It results in 96 instead of 69.

• It subtracts 22 instead of adding.

• It adds 22 correctly but starts from the wrong number.

What is the correct way to subtract 76 from 93?

• Subtract 67 in total.

• Subtract 70 then 6.

• Subtract 7 then 6.

• Subtract 60 then 7.

Why is subtracting 60 then 7 from 93 incorrect for 76?

• It subtracts 67, not 76.

• It starts from 76, not 93.

• It equals 26, not 17.

• It adds instead of subtracts.

What is the result of subtracting 76 from 93?

• 19

• 17

• 23

• 27

What is the correct result of adding 87 to 12?

• 99

• 100

• 109

• 98

Why is adding 80 then 7 the correct method for adding 87?

• It subtracts to get 75.

• It correctly adds up to 99.

• It starts from 87, not 12.

• It adds 70 then 17.

What is the first step in correctly adding 87 to 12?

• Subtract 7

• Add 7

• Add 80

• Add 8