How many 3-digit whole numbers are there between 72 and 407?

Fill in the blanks to make each of the following a true statement:

(i) 378 + 1024 = 1024 + ….

(ii) 337 + (528 + 1164) = (337 + ….) + 1164

(iii) (21 + 18) + …. = (21 + 13) + 18

(iv) 3056 + 0 = …. = 0 + 3056

By suitable arrangements, find the sum of:

(i) 311, 528, 289

(ii) 723, 834, 66, 277

(iii) 78, 203, 435, 7197, 422

Fill in the blanks to make each of the following a true statement:

(i) 375 × 57 = 57 × ….

(ii) (33 × 16) × 25 = 33 × (…. × 25)

(iii) 37 × 24 = 37 × 18 + 37 × ….

(iv) 7205 × 1 = …. = 1 × 7205

(v) 366 × 0 = ….

(vi) …. × 579 = 0

(vii) 473 × 108 = 473 × 100 + 473 × ….

(viii) 684 × 97 = 684 × 100 - …. × 3

(ix) 0 ÷ 5 = ….

(x) (14 - 14) ÷ 7 = ….