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546
↓
548

401
↓

656
↓

483
↓

826
↓

599
↓

531
↓

(1) Increase the numbers by 2.

811 + 90 =

262 + 90 =

441 – 40 =

828 – 40 =

(2) Calculate.

209 = 2 ·100+0· 10+9 · 1

993 =

469 =

726 =

920 =

654 =

(3) Decompose the numbers into a sum of multiples of decimal units.

147
+ 190

509
+ 175

358
+ 152

260
+ 376

168
+ 111

(4) Add the numbers whose sum of units is greater than 9.

539
+ 109

197
+ 205

277
+ 132

431
+ 274

312
+ 0

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