| 1. Write: add a thousand : a) 2 145, 3 145, ...................., ...................., ....................,................... ......................, ........................, ......................,.............................. . b) add 100 1 732, 1832, ..................., ..................., ......................,...................... ......................., ......................., ........................,.................... . c) add 10 : 3 968, 3978...................., ......................, ......................,...................., .........................., ......................., ........................,.................... . d) add 1: 8 995, 8996.................., ........................, .......................,......................, ..........................., ........................, ..........................,.................... . 2.Calculate
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