Page 20 - PlayFacto_B7
P. 20
Inverse operations
A ddition and subtraction are opposite, or inverse operations. Use the
inverse relationship between addition and subtraction to solve problems.
28+34=62 51-38=13
62-34=28 62-28=34 13+38=51 38+13=51
Example 1 Use the inverse operations to write the number sentences.
⑴ 45+16=61 61
45 16
`-` `=` `, `-` `=` `
⑵ 83-29=54 83 29
`+` `=` 54
`, `+` `=` `
2. Number sentence 17
A ddition and subtraction are opposite, or inverse operations. Use the
inverse relationship between addition and subtraction to solve problems.
28+34=62 51-38=13
62-34=28 62-28=34 13+38=51 38+13=51
Example 1 Use the inverse operations to write the number sentences.
⑴ 45+16=61 61
45 16
`-` `=` `, `-` `=` `
⑵ 83-29=54 83 29
`+` `=` 54
`, `+` `=` `
2. Number sentence 17
