Apply known single-digit addition and subtraction facts to mental strategies for addition and subtraction of two-, three- and four-digit numbers, including:the jump strategy on an empty number line, the split strategy, the compensation strategy, using pat

 1 Changing Numbers: 100 to 200 2 Changing Numbers: 265 to 255 3 Changing Numbers: 550 to 650 4 Changing Numbers: 300 to 299 5 Changing Numbers: 888 to 898 6 Changing Numbers: 428 to 438 7 Changing Numbers: 204 to 194 8 Changing Numbers: 402 to 412 9 Changing Numbers: 399 to 499 10 Changing Numbers - 45 to 145 11 Changing Numbers - 235 to 225 12 Changing Numbers - 990 to 890 13 Changing Numbers - 576 to 577 14 Changing Numbers - 36 to 136 15 Changing Numbers - 455 to 555 16 1000 less, 1000 more than 4215 17 1000 less, 1 more than 7999 18 1000 less, 1000 more than 3690 19 Changing Numbers - 2458 to 2558 20 Changing Numbers - 9906 to 9996 21 Changing Numbers - 7899 to 7909 22 Changing Numbers - 4323 to 4423 23 Changing Numbers - 8999 to 9000 24 1000 less, 100 more than 4035 25 1000 less, 100 more than 1000 26 1000 less, 1000 more than 1900 27 100 less, 1000 more than 1795 28 1000 less, 10 more than 8712 29 1000 less, 100 more than 6995 30 100 less, 1 more than 5999 31 1000 less, 1 more than 8799 32 100 less, 1000 more than 5000 33 1 less, 1000 more than 8000 34 Changing Numbers - 1040 to 1140 35 Changing Numbers - 820 to 1820 36 1000 less, 100 more than 6793 37 1000 less, 1 more than 3589 38 Add these 3 numbers: 14 + 5 + 2 39 Add these 3 numbers: 11 + 4 + 5 40 Add these 3 numbers: 13 + 7 + 6 41 Same or Different? Click all boxes with answer 20 42 Adding tens: 42 + 10 = ? 43 Adding tens: 38 + 20 = ? 44 Adding tens: 56 + 30 = ? 45 Changing numbers 136 to 140 46 Changing numbers 122 to 130 47 Changing numbers 154 to 160 48 Changing numbers 188 to 190 49 Changing numbers 177 to 180 50 Add three numbers: 14 + 7 + 3 51 Add three numbers: 20 + 10 + 20 52 40s zone: Add on 5 to 36. 53 40s zone: 4 more than 38 54 40s zone: 37 plus 5 55 40s zone: 4 more than 39 56 40s zone: Add on 3 to 38 57 50s zone: Add on 5 to 47. 58 50s zone: 49 plus 3 59 50s zone: 48 plus 5 60 50s zone: 4 more than 47 61 50s zone: 5 more than 46 62 Number Detectives: 10 + 20 = ? 63 Use the pattern: 2+4, 12+4, 120 + 40 64 Use the pattern: 4+1, 14+1, 140+10 65 Use The Pattern: 4+3, 14+3, 140+30 66 Use The Pattern: 2+7, 12+7, 120+70 67 Use The Pattern: 5+4, 15+4, 150+40 68 Use The Pattern: 3+6, 13+6, 130+60 69 Use The Pattern: 5+3, 15+3, 150+30 70 Beyond 20: What is 6 more than 29? 71 Beyond 50: What is 4 more than 57? 72 Beyond 70: What is 8 more than 78? 73 Beyond 30: What is 4 more than 38? 74 Beyond 60: What is 5 more than 68? 75 Addition Chains: 10 + 4 + 6 + 2, 11 + 2 + 3 + 4 76 Addition Chains: 4 + 5 + 5 + 2, 10 + 5 + 5 + 10 77 Addition Chains: 3 + 2 + 4 + 2, 7 + 2 + 3 + 4 78 Add three numbers: 14 + 12 + 8 79 Crossing 100: 4 more than 99 80 Crossing 100: 7 more than 97 81 Crossing 100: 8 more than 98 82 Crossing 100: 9 more than 92 83 Crossing 100: 5 more than 97 84 Same or Different: Click all the boxes with the answer 50. 85 Same or Different: Click all the boxes with the answer 46. 86 Same or Different: Click all the boxes with the answer 32. 87 Same or Different: Click all the boxes with the answer 45. 88 Same or Different: Click all the boxes with the answer 38. 89 Beyond 40: 6 more than 45 90 Beyond 70: 5 more than 79 91 Beyond 60: 8 more than 68 92 Beyond 50: 7 more than 58 93 Beyond 70: 9 more than 72 94 Changing Numbers 29 to 34 95 Changing Numbers 67 to 78 96 Changing Numbers 98 to 101 97 Changing Numbers 87 to 92 98 Changing Numbers 59 to 63 99 Changing Numbers 96 to 101 100 Changing Numbers 98 to 105 101 Changing Numbers 97 to 103 102 Changing Numbers 97 to 102 103 Changing Numbers 99 to 103 104 Changing Numbers 42 to 62 105 Changing Numbers 63 to 93 106 Changing Numbers 14 to 54 107 Changing Numbers 137 to 157 108 Changing Numbers 35 to 85 109 Number detectives 235+6 = * 110 Number detectives 98+7=* 111 Use The Pattern 3+5 30+50 300+500 112 Use The Pattern 3+6 30+60 600+300 113 Use The Pattern 2+4 20+40 200+400 114 Use The Pattern 3+2 30+20 200+300 115 Use The Pattern 6+2 60+20 600+200 116 Addition Chains 21 + 3 + 6 + 5, 60 + 4 + 3 + 2 117 Addition Chains 33 + 4 + 10 + 5, 28 + 3 + 9 + 8 118 Addition Chains 23 + 5 + 4 + 9, 60 + 8 + 3 + 10 119 Addition Chains 95 + 4 + 2 + 12, 94 + 3 + 3 + 7 120 Addition Chains 100 + 5 + 5 + 7, 99 + 3 + 6 + 2 121 Beyond 90: 98 + 4 122 Beyond 100: 104 + 7 123 Beyond 110: 119+3 124 Beyond 120: 128+6 125 Beyond 130: 139 + 5 126 Changing numbers: 12 + 10, +11, +111 127 Changing numbers: 28 + 10, +11, +111 128 Changing numbers: 49 + 10, +11, +111 129 Changing numbers: 88 + 10, +11, +111 130 Changing numbers: 29 + 10, +11, +111 131 Number Detectives: 100 Pairs 63 + 37 = ? 132 Use the pattern: 6+3, 60+30, 600+300 133 Use the pattern: 2+4, 20+40, 200+400 134 Use the pattern: 2+6, 20+60, 200+600 135 Use the pattern: 4+9, 40+90, 400+900 136 Use the pattern: 1+7, 10+70, 100+700 137 Adding Tens: 416 + 50 = * 138 Adding Tens: 542 + 50 = * 139 Add Hundreds: 500+246 140 Add Hundreds: 100+280 141 Add Hundreds: 300+453 142 Add Hundreds: 200+43 143 Add Hundreds: 800+163 144 Mystery number: 106+11=? 145 Mystery number: 514+12=? 146 Mystery number: 913+13=? 147 Mystery number: 711+17=? 148 Mystery number: 133+16=? 149 Use the pattern: 5+2,50+20, 500+200=? 150 Use the pattern: 5+4,50+40, 500+400=? 151 Use the pattern: 7+1,70+10, 700+100=? 152 Use the pattern: 2+3,20+30, 200+300=? 153 Use the pattern: 3+8,30+80, 300+800=? 154 Same or different:19-12,2+5,3+4,33-26,16-8 155 Same or different:13-4,6+3,12-5,19-8,32-23 156 Same or different:44-8,14+23,22+18,19+17,54-18 157 Same or different:43-7,21+17,13+22,18+16,53-17 158 Same or different:13+6,34-15,43-25,32-13,58-37 159 Adding Tens: 235+50 =? 160 Adding Tens: 338+50=? 161 Adding Tens: 562+30=? 162 Taking tens: 40 - 30 = ? 163 Taking tens: 50 - 20 = ? 164 Taking tens: 80 - 40 = ? 165 Taking tens: 70 - 10 = ? 166 Taking tens: 70 - 40 = ? 167 Taking tens: 40 - 30 = ? 168 Subtraction Chain - 29-8=21-3=? 169 Subtraction Chain - 26-5=21-4=? 170 Use the pattern: 10, 20 & 80 - 5 = ? 171 Use the pattern: 10, 20 & 40 - 3 = ? 172 Use the pattern: 10, 20 & 90 - 7 = ? 173 Use the pattern: 10, 20 & 50 - 4 = ? 174 Use the pattern: 10, 20 & 30 - 8 = ? 175 Taking ten: 46-10 176 Taking ten: 72-10 177 Taking ten: 39-10 178 Taking ten: 55-10 179 Taking ten: 81-10 180 Use the pattern 16-7=? 26-7=?, 36-7=? 181 Use the pattern 13-6=? 23-6=?, 33-6=? 182 Use the pattern 11-5=? 21-5=?, 31-5=? 183 Use the pattern 12-9=? 22-9=?, 32-9=? 184 Use the pattern 19-4=? 29-4=?, 39-4=? 185 Use the pattern 17-8=? 27-8=?, 37-8=? 186 Same Difference - Difference between 10 and 40. 187 Number detectives: 30 - 14 = ? 188 Use the pattern: 9-5, 90-50, 900-500 189 Use the pattern: 8-5, 80-50, 800-500 190 Use the pattern: 6-2, 60-20, 600-200 191 Use the pattern: 9-8, 90-80, 900-800 192 Use the pattern: 5-3, 50-30, 500-300 193 Use the pattern: 8-2, 80-20, 800-200 194 Count Down: 6 less than 41 195 Count Down: 7 less than 52 196 Count Down: 3 less than 42 197 Count Down: 6 less than 43 198 Count Down: 8 less than 47 199 Taking Tens: 44 - 20 200 Taking Tens: 68 - 30 201 Taking Tens: 98 - 50 202 Taking Tens: 32 - 20 203 Taking Tens: 59 - 40 204 Taking Tens: 87 - 20 205 Taking Tens: 72 - 40 206 Subtract.chains 48 - 7 - 2 - 9, 35 - 4 - 3 - 8 207 Subtract.chains 47 - 4 - 3 - 7, 28 - 8 - 2 - 5 208 Subtract.chains 23 - 4 - 1 - 3, 36 - 5 - 2 - 6 209 Subtract.chains 32 - 4 - 7 - 4, 45 - 2 - 10 - 5 210 Subtract.chains 28 - 5 - 2 - 10, 50 - 5 - 3 - 2 211 Spot the difference: 102 & 97, 27 & 19, 100 & 60 212 Changing Numbers 55-37=? 213 Changing Numbers 65-54=? 214 Changing Numbers 48-22=? 215 Changing Numbers 36-16=? 216 Changing Numbers 51-28=? 217 Changing Numbers 42-32=? 218 Number Detectives: 30 - 17 = ? 219 Number Detectives: 30 - 14 = ? 220 Count down 52-4=? 221 Count down 43-6=? 222 Count down 61-5=? 223 Count down 36-8=? 224 Count down 72-7=? 225 Count down 94-9=? 226 Take Ten 42 - 10 227