Find the approximate difference to the nearest ten :

(i) (64 - 29)

(ii) (186 - 49)

(iii) (429 - 206)

(i) Round 64 to the nearest ten: The units digit is 4, so it rounds down to 60.

Round 29 to the nearest ten: The units digit is 9, so it rounds up to 30.

Approximate difference: 60 − 30 = 30

Hence, the approximate difference = 30.

(ii) (186 − 49)

Round 186 to the nearest ten: The units digit is 6, so it rounds up to 190.

Round 49 to the nearest ten: The units digit is 9, so it rounds up to 50.

Approximate difference: 190 − 50 = 140

Hence, the approximate difference = 140.

(iii) (429 − 206)

Round 429 to the nearest ten: The units digit is 9, so it rounds up to 430.

Round 206 to the nearest ten: The units digit is 6, so it rounds up to 210.

Approximate difference: 430 − 210 = 220

Hence, the approximate difference = 220.